* Patch by Thomas Elste, 10 Feb 2004:

[people/ms/u-boot.git] / common / cmd_mem.c

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * Memory Functions
 *
 * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
 */

#include <common.h>
#include <command.h>
#if (CONFIG_COMMANDS & CFG_CMD_MMC)
#include <mmc.h>
#endif
#ifdef CONFIG_HAS_DATAFLASH
#include <dataflash.h>
#endif

#if (CONFIG_COMMANDS & (CFG_CMD_MEMORY  | \
                        CFG_CMD_I2C     | \
                        CFG_CMD_PCI     | \
                        CMD_CMD_PORTIO  ) )
int cmd_get_data_size(char* arg, int default_size)
{
        /* Check for a size specification .b, .w or .l.
         */
        int len = strlen(arg);
        if (len > 2 && arg[len-2] == '.') {
                switch(arg[len-1]) {
                case 'b':
                        return 1;
                case 'w':
                        return 2;
                case 'l':
                        return 4;
                case 's':
                        return -2;
                default:
                        return -1;
                }
        }
        return default_size;
}
#endif

#if (CONFIG_COMMANDS & CFG_CMD_MEMORY)

#ifdef  CMD_MEM_DEBUG
#define PRINTF(fmt,args...)     printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

static int mod_mem(cmd_tbl_t *, int, int, int, char *[]);

/* Display values from last command.
 * Memory modify remembered values are different from display memory.
 */
uint    dp_last_addr, dp_last_size;
uint    dp_last_length = 0x40;
uint    mm_last_addr, mm_last_size;

static  ulong   base_address = 0;

/* Memory Display
 *
 * Syntax:
 *      md{.b, .w, .l} {addr} {len}
 */
#define DISP_LINE_LEN   16
int do_mem_md ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        ulong   addr, length;
        ulong   i, nbytes, linebytes;
        u_char  *cp;
        int     size;
        int rc = 0;

        /* We use the last specified parameters, unless new ones are
         * entered.
         */
        addr = dp_last_addr;
        size = dp_last_size;
        length = dp_last_length;

        if (argc < 2) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                return 1;
        }

        if ((flag & CMD_FLAG_REPEAT) == 0) {
                /* New command specified.  Check for a size specification.
                 * Defaults to long if no or incorrect specification.
                 */
                if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                        return 1;

                /* Address is specified since argc > 1
                */
                addr = simple_strtoul(argv[1], NULL, 16);
                addr += base_address;

                /* If another parameter, it is the length to display.
                 * Length is the number of objects, not number of bytes.
                 */
                if (argc > 2)
                        length = simple_strtoul(argv[2], NULL, 16);
        }

        /* Print the lines.
         *
         * We buffer all read data, so we can make sure data is read only
         * once, and all accesses are with the specified bus width.
         */
        nbytes = length * size;
        do {
                char    linebuf[DISP_LINE_LEN];
                uint    *uip = (uint   *)linebuf;
                ushort  *usp = (ushort *)linebuf;
                u_char  *ucp = (u_char *)linebuf;
#ifdef CONFIG_HAS_DATAFLASH
                int rc;
#endif
                printf("%08lx:", addr);
                linebytes = (nbytes>DISP_LINE_LEN)?DISP_LINE_LEN:nbytes;

#ifdef CONFIG_HAS_DATAFLASH
                if ((rc = read_dataflash(addr, (linebytes/size)*size, linebuf)) == DATAFLASH_OK){
                        /* if outside dataflash */
                        /*if (rc != 1) {
                                dataflash_perror (rc);
                                return (1);
                        }*/
                        for (i=0; i<linebytes; i+= size) {
                                if (size == 4) {
                                        printf(" %08x", *uip++);
                                } else if (size == 2) {
                                        printf(" %04x", *usp++);
                                } else {
                                        printf(" %02x", *ucp++);
                                }
                                addr += size;
                        }

                } else {        /* addr does not correspond to DataFlash */
#endif
                for (i=0; i<linebytes; i+= size) {
                        if (size == 4) {
                                printf(" %08x", (*uip++ = *((uint *)addr)));
                        } else if (size == 2) {
                                printf(" %04x", (*usp++ = *((ushort *)addr)));
                        } else {
                                printf(" %02x", (*ucp++ = *((u_char *)addr)));
                        }
                        addr += size;
                }
#ifdef CONFIG_HAS_DATAFLASH
                }
#endif
                printf("    ");
                cp = linebuf;
                for (i=0; i<linebytes; i++) {
                        if ((*cp < 0x20) || (*cp > 0x7e))
                                printf(".");
                        else
                                printf("%c", *cp);
                        cp++;
                }
                printf("\n");
                nbytes -= linebytes;
                if (ctrlc()) {
                        rc = 1;
                        break;
                }
        } while (nbytes > 0);

        dp_last_addr = addr;
        dp_last_length = length;
        dp_last_size = size;
        return (rc);
}

int do_mem_mm ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        return mod_mem (cmdtp, 1, flag, argc, argv);
}
int do_mem_nm ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        return mod_mem (cmdtp, 0, flag, argc, argv);
}

int do_mem_mw ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        ulong   addr, writeval, count;
        int     size;

        if ((argc < 3) || (argc > 4)) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                return 1;
        }

        /* Check for size specification.
        */
        if ((size = cmd_get_data_size(argv[0], 4)) < 1)
                return 1;

        /* Address is specified since argc > 1
        */
        addr = simple_strtoul(argv[1], NULL, 16);
        addr += base_address;

        /* Get the value to write.
        */
        writeval = simple_strtoul(argv[2], NULL, 16);

        /* Count ? */
        if (argc == 4) {
                count = simple_strtoul(argv[3], NULL, 16);
        } else {
                count = 1;
        }

        while (count-- > 0) {
                if (size == 4)
                        *((ulong  *)addr) = (ulong )writeval;
                else if (size == 2)
                        *((ushort *)addr) = (ushort)writeval;
                else
                        *((u_char *)addr) = (u_char)writeval;
                addr += size;
        }
        return 0;
}

int do_mem_cmp (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        ulong   addr1, addr2, count, ngood;
        int     size;
        int     rcode = 0;

        if (argc != 4) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                return 1;
        }

        /* Check for size specification.
        */
        if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                return 1;

        addr1 = simple_strtoul(argv[1], NULL, 16);
        addr1 += base_address;

        addr2 = simple_strtoul(argv[2], NULL, 16);
        addr2 += base_address;

        count = simple_strtoul(argv[3], NULL, 16);

#ifdef CONFIG_HAS_DATAFLASH
        if (addr_dataflash(addr1) | addr_dataflash(addr2)){
                printf("Comparison with DataFlash space not supported.\n\r");
                return 0;
        }
#endif

        ngood = 0;

        while (count-- > 0) {
                if (size == 4) {
                        ulong word1 = *(ulong *)addr1;
                        ulong word2 = *(ulong *)addr2;
                        if (word1 != word2) {
                                printf("word at 0x%08lx (0x%08lx) "
                                        "!= word at 0x%08lx (0x%08lx)\n",
                                        addr1, word1, addr2, word2);
                                rcode = 1;
                                break;
                        }
                }
                else if (size == 2) {
                        ushort hword1 = *(ushort *)addr1;
                        ushort hword2 = *(ushort *)addr2;
                        if (hword1 != hword2) {
                                printf("halfword at 0x%08lx (0x%04x) "
                                        "!= halfword at 0x%08lx (0x%04x)\n",
                                        addr1, hword1, addr2, hword2);
                                rcode = 1;
                                break;
                        }
                }
                else {
                        u_char byte1 = *(u_char *)addr1;
                        u_char byte2 = *(u_char *)addr2;
                        if (byte1 != byte2) {
                                printf("byte at 0x%08lx (0x%02x) "
                                        "!= byte at 0x%08lx (0x%02x)\n",
                                        addr1, byte1, addr2, byte2);
                                rcode = 1;
                                break;
                        }
                }
                ngood++;
                addr1 += size;
                addr2 += size;
        }

        printf("Total of %ld %s%s were the same\n",
                ngood, size == 4 ? "word" : size == 2 ? "halfword" : "byte",
                ngood == 1 ? "" : "s");
        return rcode;
}

int do_mem_cp ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        ulong   addr, dest, count;
        int     size;

        if (argc != 4) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                return 1;
        }

        /* Check for size specification.
        */
        if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                return 1;

        addr = simple_strtoul(argv[1], NULL, 16);
        addr += base_address;

        dest = simple_strtoul(argv[2], NULL, 16);
        dest += base_address;

        count = simple_strtoul(argv[3], NULL, 16);

        if (count == 0) {
                puts ("Zero length ???\n");
                return 1;
        }

#ifndef CFG_NO_FLASH
        /* check if we are copying to Flash */
        if ( (addr2info(dest) != NULL)
#ifdef CONFIG_HAS_DATAFLASH
           && (!addr_dataflash(addr))
#endif
           ) {
                int rc;

                printf ("Copy to Flash... ");

                rc = flash_write ((uchar *)addr, dest, count*size);
                if (rc != 0) {
                        flash_perror (rc);
                        return (1);
                }
                puts ("done\n");
                return 0;
        }
#endif

#if (CONFIG_COMMANDS & CFG_CMD_MMC)
        if (mmc2info(dest)) {
                int rc;

                printf ("Copy to MMC... ");
                switch (rc = mmc_write ((uchar *)addr, dest, count*size)) {
                case 0:
                        printf ("\n");
                        return 1;
                case -1:
                        printf("failed\n");
                        return 1;
                default:
                        printf ("%s[%d] FIXME: rc=%d\n",__FILE__,__LINE__,rc);
                        return 1;
                }
                puts ("done\n");
                return 0;
        }

        if (mmc2info(addr)) {
                int rc;

                printf ("Copy from MMC... ");
                switch (rc = mmc_read (addr, (uchar *)dest, count*size)) {
                case 0:
                        printf ("\n");
                        return 1;
                case -1:
                        printf("failed\n");
                        return 1;
                default:
                        printf ("%s[%d] FIXME: rc=%d\n",__FILE__,__LINE__,rc);
                        return 1;
                }
                puts ("done\n");
                return 0;
        }
#endif

#ifdef CONFIG_HAS_DATAFLASH
        /* Check if we are copying from RAM or Flash to DataFlash */
        if (addr_dataflash(dest) && !addr_dataflash(addr)){
                int rc;

                printf ("Copy to DataFlash... ");

                rc = write_dataflash (dest, addr, count*size);

                if (rc != 1) {
                        dataflash_perror (rc);
                        return (1);
                }
                puts ("done\n");
                return 0;
        }

        /* Check if we are copying from DataFlash to RAM */
        if (addr_dataflash(addr) && !addr_dataflash(dest) && (addr2info(dest)==NULL) ){
                int rc;
                rc = read_dataflash(addr, count * size, (char *) dest);
                if (rc != 1) {
                        dataflash_perror (rc);
                        return (1);
                }
                return 0;
        }

        if (addr_dataflash(addr) && addr_dataflash(dest)){
                printf("Unsupported combination of source/destination.\n\r");
                return 1;
        }
#endif

        while (count-- > 0) {
                if (size == 4)
                        *((ulong  *)dest) = *((ulong  *)addr);
                else if (size == 2)
                        *((ushort *)dest) = *((ushort *)addr);
                else
                        *((u_char *)dest) = *((u_char *)addr);
                addr += size;
                dest += size;
        }
        return 0;
}

int do_mem_base (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        if (argc > 1) {
                /* Set new base address.
                */
                base_address = simple_strtoul(argv[1], NULL, 16);
        }
        /* Print the current base address.
        */
        printf("Base Address: 0x%08lx\n", base_address);
        return 0;
}

int do_mem_loop (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        ulong   addr, length, i, junk;
        int     size;
        volatile uint   *longp;
        volatile ushort *shortp;
        volatile u_char *cp;

        if (argc < 3) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                return 1;
        }

        /* Check for a size spefication.
         * Defaults to long if no or incorrect specification.
         */
        if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                return 1;

        /* Address is always specified.
        */
        addr = simple_strtoul(argv[1], NULL, 16);

        /* Length is the number of objects, not number of bytes.
        */
        length = simple_strtoul(argv[2], NULL, 16);

        /* We want to optimize the loops to run as fast as possible.
         * If we have only one object, just run infinite loops.
         */
        if (length == 1) {
                if (size == 4) {
                        longp = (uint *)addr;
                        for (;;)
                                i = *longp;
                }
                if (size == 2) {
                        shortp = (ushort *)addr;
                        for (;;)
                                i = *shortp;
                }
                cp = (u_char *)addr;
                for (;;)
                        i = *cp;
        }

        if (size == 4) {
                for (;;) {
                        longp = (uint *)addr;
                        i = length;
                        while (i-- > 0)
                                junk = *longp++;
                }
        }
        if (size == 2) {
                for (;;) {
                        shortp = (ushort *)addr;
                        i = length;
                        while (i-- > 0)
                                junk = *shortp++;
                }
        }
        for (;;) {
                cp = (u_char *)addr;
                i = length;
                while (i-- > 0)
                        junk = *cp++;
        }
}

/*
 * Perform a memory test. A more complete alternative test can be
 * configured using CFG_ALT_MEMTEST. The complete test loops until
 * interrupted by ctrl-c or by a failure of one of the sub-tests.
 */
int do_mem_mtest (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        vu_long *addr, *start, *end;
        ulong   val;
        ulong   readback;

#if defined(CFG_ALT_MEMTEST)
        vu_long addr_mask;
        vu_long offset;
        vu_long test_offset;
        vu_long pattern;
        vu_long temp;
        vu_long anti_pattern;
        vu_long num_words;
#if defined(CFG_MEMTEST_SCRATCH)
        vu_long *dummy = (vu_long*)CFG_MEMTEST_SCRATCH;
#else
        vu_long *dummy = NULL;
#endif
        int     j;
        int iterations = 1;

        static const ulong bitpattern[] = {
                0x00000001,     /* single bit */
                0x00000003,     /* two adjacent bits */
                0x00000007,     /* three adjacent bits */
                0x0000000F,     /* four adjacent bits */
                0x00000005,     /* two non-adjacent bits */
                0x00000015,     /* three non-adjacent bits */
                0x00000055,     /* four non-adjacent bits */
                0xaaaaaaaa,     /* alternating 1/0 */
        };
#else
        ulong   incr;
        ulong   pattern;
        int     rcode = 0;
#endif

        if (argc > 1) {
                start = (ulong *)simple_strtoul(argv[1], NULL, 16);
        } else {
                start = (ulong *)CFG_MEMTEST_START;
        }

        if (argc > 2) {
                end = (ulong *)simple_strtoul(argv[2], NULL, 16);
        } else {
                end = (ulong *)(CFG_MEMTEST_END);
        }

        if (argc > 3) {
                pattern = (ulong)simple_strtoul(argv[3], NULL, 16);
        } else {
                pattern = 0;
        }

#if defined(CFG_ALT_MEMTEST)
        printf ("Testing %08x ... %08x:\n", (uint)start, (uint)end);
        PRINTF("%s:%d: start 0x%p end 0x%p\n",
                __FUNCTION__, __LINE__, start, end);

        for (;;) {
                if (ctrlc()) {
                        putc ('\n');
                        return 1;
                }

                printf("Iteration: %6d\r", iterations);
                PRINTF("Iteration: %6d\n", iterations);
                iterations++;

                /*
                 * Data line test: write a pattern to the first
                 * location, write the 1's complement to a 'parking'
                 * address (changes the state of the data bus so a
                 * floating bus doen't give a false OK), and then
                 * read the value back. Note that we read it back
                 * into a variable because the next time we read it,
                 * it might be right (been there, tough to explain to
                 * the quality guys why it prints a failure when the
                 * "is" and "should be" are obviously the same in the
                 * error message).
                 *
                 * Rather than exhaustively testing, we test some
                 * patterns by shifting '1' bits through a field of
                 * '0's and '0' bits through a field of '1's (i.e.
                 * pattern and ~pattern).
                 */
                addr = start;
                for (j = 0; j < sizeof(bitpattern)/sizeof(bitpattern[0]); j++) {
                    val = bitpattern[j];
                    for(; val != 0; val <<= 1) {
                        *addr  = val;
                        *dummy  = ~val; /* clear the test data off of the bus */
                        readback = *addr;
                        if(readback != val) {
                             printf ("FAILURE (data line): "
                                "expected %08lx, actual %08lx\n",
                                          val, readback);
                        }
                        *addr  = ~val;
                        *dummy  = val;
                        readback = *addr;
                        if(readback != ~val) {
                            printf ("FAILURE (data line): "
                                "Is %08lx, should be %08lx\n",
                                        val, readback);
                        }
                    }
                }

                /*
                 * Based on code whose Original Author and Copyright
                 * information follows: Copyright (c) 1998 by Michael
                 * Barr. This software is placed into the public
                 * domain and may be used for any purpose. However,
                 * this notice must not be changed or removed and no
                 * warranty is either expressed or implied by its
                 * publication or distribution.
                 */

                /*
                 * Address line test
                 *
                 * Description: Test the address bus wiring in a
                 *              memory region by performing a walking
                 *              1's test on the relevant bits of the
                 *              address and checking for aliasing.
                 *              This test will find single-bit
                 *              address failures such as stuck -high,
                 *              stuck-low, and shorted pins. The base
                 *              address and size of the region are
                 *              selected by the caller.
                 *
                 * Notes:       For best results, the selected base
                 *              address should have enough LSB 0's to
                 *              guarantee single address bit changes.
                 *              For example, to test a 64-Kbyte
                 *              region, select a base address on a
                 *              64-Kbyte boundary. Also, select the
                 *              region size as a power-of-two if at
                 *              all possible.
                 *
                 * Returns:     0 if the test succeeds, 1 if the test fails.
                 *
                 * ## NOTE ##   Be sure to specify start and end
                 *              addresses such that addr_mask has
                 *              lots of bits set. For example an
                 *              address range of 01000000 02000000 is
                 *              bad while a range of 01000000
                 *              01ffffff is perfect.
                 */
                addr_mask = ((ulong)end - (ulong)start)/sizeof(vu_long);
                pattern = (vu_long) 0xaaaaaaaa;
                anti_pattern = (vu_long) 0x55555555;

                PRINTF("%s:%d: addr mask = 0x%.8lx\n",
                        __FUNCTION__, __LINE__,
                        addr_mask);
                /*
                 * Write the default pattern at each of the
                 * power-of-two offsets.
                 */
                for (offset = 1; (offset & addr_mask) != 0; offset <<= 1) {
                        start[offset] = pattern;
                }

                /*
                 * Check for address bits stuck high.
                 */
                test_offset = 0;
                start[test_offset] = anti_pattern;

                for (offset = 1; (offset & addr_mask) != 0; offset <<= 1) {
                    temp = start[offset];
                    if (temp != pattern) {
                        printf ("\nFAILURE: Address bit stuck high @ 0x%.8lx:"
                                " expected 0x%.8lx, actual 0x%.8lx\n",
                                (ulong)&start[offset], pattern, temp);
                        return 1;
                    }
                }
                start[test_offset] = pattern;

                /*
                 * Check for addr bits stuck low or shorted.
                 */
                for (test_offset = 1; (test_offset & addr_mask) != 0; test_offset <<= 1) {
                    start[test_offset] = anti_pattern;

                    for (offset = 1; (offset & addr_mask) != 0; offset <<= 1) {
                        temp = start[offset];
                        if ((temp != pattern) && (offset != test_offset)) {
                            printf ("\nFAILURE: Address bit stuck low or shorted @"
                                " 0x%.8lx: expected 0x%.8lx, actual 0x%.8lx\n",
                                (ulong)&start[offset], pattern, temp);
                            return 1;
                        }
                    }
                    start[test_offset] = pattern;
                }

                /*
                 * Description: Test the integrity of a physical
                 *              memory device by performing an
                 *              increment/decrement test over the
                 *              entire region. In the process every
                 *              storage bit in the device is tested
                 *              as a zero and a one. The base address
                 *              and the size of the region are
                 *              selected by the caller.
                 *
                 * Returns:     0 if the test succeeds, 1 if the test fails.
                 */
                num_words = ((ulong)end - (ulong)start)/sizeof(vu_long) + 1;

                /*
                 * Fill memory with a known pattern.
                 */
                for (pattern = 1, offset = 0; offset < num_words; pattern++, offset++) {
                        start[offset] = pattern;
                }

                /*
                 * Check each location and invert it for the second pass.
                 */
                for (pattern = 1, offset = 0; offset < num_words; pattern++, offset++) {
                    temp = start[offset];
                    if (temp != pattern) {
                        printf ("\nFAILURE (read/write) @ 0x%.8lx:"
                                " expected 0x%.8lx, actual 0x%.8lx)\n",
                                (ulong)&start[offset], pattern, temp);
                        return 1;
                    }

                    anti_pattern = ~pattern;
                    start[offset] = anti_pattern;
                }

                /*
                 * Check each location for the inverted pattern and zero it.
                 */
                for (pattern = 1, offset = 0; offset < num_words; pattern++, offset++) {
                    anti_pattern = ~pattern;
                    temp = start[offset];
                    if (temp != anti_pattern) {
                        printf ("\nFAILURE (read/write): @ 0x%.8lx:"
                                " expected 0x%.8lx, actual 0x%.8lx)\n",
                                (ulong)&start[offset], anti_pattern, temp);
                        return 1;
                    }
                    start[offset] = 0;
                }
        }

#else /* The original, quickie test */
        incr = 1;
        for (;;) {
                if (ctrlc()) {
                        putc ('\n');
                        return 1;
                }

                printf ("\rPattern %08lX  Writing..."
                        "%12s"
                        "\b\b\b\b\b\b\b\b\b\b",
                        pattern, "");

                for (addr=start,val=pattern; addr<end; addr++) {
                        *addr = val;
                        val  += incr;
                }

                printf("Reading...");

                for (addr=start,val=pattern; addr<end; addr++) {
                        readback = *addr;
                        if (readback != val) {
                                printf ("\nMem error @ 0x%08X: "
                                        "found %08lX, expected %08lX\n",
                                        (uint)addr, readback, val);
                                rcode = 1;
                        }
                        val += incr;
                }

                /*
                 * Flip the pattern each time to make lots of zeros and
                 * then, the next time, lots of ones.  We decrement
                 * the "negative" patterns and increment the "positive"
                 * patterns to preserve this feature.
                 */
                if(pattern & 0x80000000) {
                        pattern = -pattern;     /* complement & increment */
                }
                else {
                        pattern = ~pattern;
                }
                incr = -incr;
        }
        return rcode;
#endif
}


/* Modify memory.
 *
 * Syntax:
 *      mm{.b, .w, .l} {addr}
 *      nm{.b, .w, .l} {addr}
 */
static int
mod_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char *argv[])
{
        ulong   addr, i;
        int     nbytes, size;
        extern char console_buffer[];

        if (argc != 2) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                return 1;
        }

#ifdef CONFIG_BOOT_RETRY_TIME
        reset_cmd_timeout();    /* got a good command to get here */
#endif
        /* We use the last specified parameters, unless new ones are
         * entered.
         */
        addr = mm_last_addr;
        size = mm_last_size;

        if ((flag & CMD_FLAG_REPEAT) == 0) {
                /* New command specified.  Check for a size specification.
                 * Defaults to long if no or incorrect specification.
                 */
                if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                        return 1;

                /* Address is specified since argc > 1
                */
                addr = simple_strtoul(argv[1], NULL, 16);
                addr += base_address;
        }

#ifdef CONFIG_HAS_DATAFLASH
        if (addr_dataflash(addr)){
                printf("Can't modify DataFlash in place. Use cp instead.\n\r");
                return 0;
        }
#endif

        /* Print the address, followed by value.  Then accept input for
         * the next value.  A non-converted value exits.
         */
        do {
                printf("%08lx:", addr);
                if (size == 4)
                        printf(" %08x", *((uint   *)addr));
                else if (size == 2)
                        printf(" %04x", *((ushort *)addr));
                else
                        printf(" %02x", *((u_char *)addr));

                nbytes = readline (" ? ");
                if (nbytes == 0 || (nbytes == 1 && console_buffer[0] == '-')) {
                        /* <CR> pressed as only input, don't modify current
                         * location and move to next. "-" pressed will go back.
                         */
                        if (incrflag)
                                addr += nbytes ? -size : size;
                        nbytes = 1;
#ifdef CONFIG_BOOT_RETRY_TIME
                        reset_cmd_timeout(); /* good enough to not time out */
#endif
                }
#ifdef CONFIG_BOOT_RETRY_TIME
                else if (nbytes == -2) {
                        break;  /* timed out, exit the command  */
                }
#endif
                else {
                        char *endp;
                        i = simple_strtoul(console_buffer, &endp, 16);
                        nbytes = endp - console_buffer;
                        if (nbytes) {
#ifdef CONFIG_BOOT_RETRY_TIME
                                /* good enough to not time out
                                 */
                                reset_cmd_timeout();
#endif
                                if (size == 4)
                                        *((uint   *)addr) = i;
                                else if (size == 2)
                                        *((ushort *)addr) = i;
                                else
                                        *((u_char *)addr) = i;
                                if (incrflag)
                                        addr += size;
                        }
                }
        } while (nbytes);

        mm_last_addr = addr;
        mm_last_size = size;
        return 0;
}

int do_mem_crc (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        ulong addr, length;
        ulong crc;
        ulong *ptr;

        if (argc < 3) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                return 1;
        }

        addr = simple_strtoul (argv[1], NULL, 16);
        addr += base_address;

        length = simple_strtoul (argv[2], NULL, 16);

        crc = crc32 (0, (const uchar *) addr, length);

        printf ("CRC32 for %08lx ... %08lx ==> %08lx\n",
                        addr, addr + length - 1, crc);

        if (argc > 3) {
                ptr = (ulong *) simple_strtoul (argv[3], NULL, 16);
                *ptr = crc;
        }

        return 0;
}

/**************************************************/
#if (CONFIG_COMMANDS & CFG_CMD_MEMORY)
U_BOOT_CMD(
        md,     3,     1,      do_mem_md,
        "md      - memory display\n",
        "[.b, .w, .l] address [# of objects]\n    - memory display\n"
);


U_BOOT_CMD(
        mm,     2,      1,       do_mem_mm,
        "mm      - memory modify (auto-incrementing)\n",
        "[.b, .w, .l] address\n" "    - memory modify, auto increment address\n"
);


U_BOOT_CMD(
        nm,     2,          1,          do_mem_nm,
        "nm      - memory modify (constant address)\n",
        "[.b, .w, .l] address\n    - memory modify, read and keep address\n"
);

U_BOOT_CMD(
        mw,    4,    1,     do_mem_mw,
        "mw      - memory write (fill)\n",
        "[.b, .w, .l] address value [count]\n    - write memory\n"
);

U_BOOT_CMD(
        cp,    4,    1,    do_mem_cp,
        "cp      - memory copy\n",
        "[.b, .w, .l] source target count\n    - copy memory\n"
);

U_BOOT_CMD(
        cmp,    4,     1,     do_mem_cmp,
        "cmp     - memory compare\n",
        "[.b, .w, .l] addr1 addr2 count\n    - compare memory\n"
);

U_BOOT_CMD(
        crc32,    4,    1,     do_mem_crc,
        "crc32   - checksum calculation\n",
        "address count [addr]\n    - compute CRC32 checksum [save at addr]\n"
);

U_BOOT_CMD(
        base,    2,    1,     do_mem_base,
        "base    - print or set address offset\n",
        "\n    - print address offset for memory commands\n"
        "base off\n    - set address offset for memory commands to 'off'\n"
);

U_BOOT_CMD(
        loop,    3,    1,    do_mem_loop,
        "loop    - infinite loop on address range\n",
        "[.b, .w, .l] address number_of_objects\n"
        "    - loop on a set of addresses\n"
);

U_BOOT_CMD(
        mtest,    4,    1,     do_mem_mtest,
        "mtest   - simple RAM test\n",
        "[start [end [pattern]]]\n"
        "    - simple RAM read/write test\n"
);

#endif
#endif  /* CFG_CMD_MEMORY */