common/cmd_bootldr.c

   1 /*
   2  * U-boot - bootldr.c
   3  *
   4  * Copyright (c) 2005-2008 Analog Devices Inc.
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * Licensed under the GPL-2 or later.
  10  */
  11
  12 #include <config.h>
  13 #include <common.h>
  14 #include <command.h>
  15
  16 #include <asm/blackfin.h>
  17 #include <asm/mach-common/bits/bootrom.h>
  18
  19 /* Simple sanity check on the specified address to make sure it contains
  20  * an LDR image of some sort.
  21  */
  22 static bool ldr_valid_signature(uint8_t *data)
  23 {
  24 #if defined(__ADSPBF561__)
  25
  26         /* BF56x has a 4 byte global header */
  27         if (data[3] == 0xA0)
  28                 return true;
  29
  30 #elif defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
  31       defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__) || \
  32       defined(__ADSPBF538__) || defined(__ADSPBF539__)
  33
  34         /* all the BF53x should start at this address mask */
  35         uint32_t addr;
  36         memmove(&addr, data, sizeof(addr));
  37         if ((addr & 0xFF0FFF0F) == 0xFF000000)
  38                 return true;
  39 #else
  40
  41         /* everything newer has a magic byte */
  42         uint32_t count;
  43         memmove(&count, data + 8, sizeof(count));
  44         if (data[3] == 0xAD && count == 0)
  45                 return true;
  46
  47 #endif
  48
  49         return false;
  50 }
  51
  52 /* If the Blackfin is new enough, the Blackfin on-chip ROM supports loading
  53  * LDRs from random memory addresses.  So whenever possible, use that.  In
  54  * the older cases (BF53x/BF561), parse the LDR format ourselves.
  55  */
  56 #define ZEROFILL  0x0001
  57 #define RESVECT   0x0002
  58 #define INIT      0x0008
  59 #define IGNORE    0x0010
  60 #define FINAL     0x8000
  61 static void ldr_load(uint8_t *base_addr)
  62 {
  63 #if defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
  64   /*defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__) ||*/\
  65     defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__)
  66
  67         uint32_t addr;
  68         uint32_t count;
  69         uint16_t flags;
  70
  71         /* the bf56x has a 4 byte global header ... but it is useless to
  72          * us when booting an LDR from a memory address, so skip it
  73          */
  74 # ifdef __ADSPBF561__
  75         base_addr += 4;
  76 # endif
  77
  78         memmove(&flags, base_addr + 8, sizeof(flags));
  79         bfin_write_EVT1(flags & RESVECT ? 0xFFA00000 : 0xFFA08000);
  80
  81         do {
  82                 /* block header may not be aligned */
  83                 memmove(&addr, base_addr, sizeof(addr));
  84                 memmove(&count, base_addr+4, sizeof(count));
  85                 memmove(&flags, base_addr+8, sizeof(flags));
  86                 base_addr += sizeof(addr) + sizeof(count) + sizeof(flags);
  87
  88                 printf("loading to 0x%08x (0x%x bytes) flags: 0x%04x\n",
  89                         addr, count, flags);
  90
  91                 if (!(flags & IGNORE)) {
  92                         if (flags & ZEROFILL)
  93                                 memset((void *)addr, 0x00, count);
  94                         else
  95                                 memcpy((void *)addr, base_addr, count);
  96
  97                         if (flags & INIT) {
  98                                 void (*init)(void) = (void *)addr;
  99                                 init();
 100                         }
 101                 }
 102
 103                 if (!(flags & ZEROFILL))
 104                         base_addr += count;
 105         } while (!(flags & FINAL));
 106
 107 #endif
 108 }
 109
 110 /* For BF537, we use the _BOOTROM_BOOT_DXE_FLASH funky ROM function.
 111  * For all other BF53x/BF56x, we just call the entry point.
 112  * For everything else (newer), we use _BOOTROM_MEMBOOT ROM function.
 113  */
 114 static void ldr_exec(void *addr)
 115 {
 116 #if defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__)
 117
 118         /* restore EVT1 to reset value as this is what the bootrom uses as
 119          * the default entry point when booting the final block of LDRs
 120          */
 121         bfin_write_EVT1(L1_INST_SRAM);
 122         __asm__("call (%0);" : : "a"(_BOOTROM_MEMBOOT), "q7"(addr) : "RETS", "memory");
 123
 124 #elif defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
 125       defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__)
 126
 127         void (*ldr_entry)(void) = (void *)bfin_read_EVT1();
 128         ldr_entry();
 129
 130 #else
 131
 132         int32_t (*BOOTROM_MEM)(void *, int32_t, int32_t, void *) = (void *)_BOOTROM_MEMBOOT;
 133         BOOTROM_MEM(addr, 0, 0, NULL);
 134
 135 #endif
 136 }
 137
 138 /*
 139  * the bootldr command loads an address, checks to see if there
 140  *   is a Boot stream that the on-chip BOOTROM can understand,
 141  *   and loads it via the BOOTROM Callback. It is possible
 142  *   to also add booting from SPI, or TWI, but this function does
 143  *   not currently support that.
 144  */
 145 int do_bootldr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 146 {
 147         void *addr;
 148
 149         /* Get the address */
 150         if (argc < 2)
 151                 addr = (void *)load_addr;
 152         else
 153                 addr = (void *)simple_strtoul(argv[1], NULL, 16);
 154
 155         /* Check if it is a LDR file */
 156         if (ldr_valid_signature(addr)) {
 157                 printf("## Booting ldr image at 0x%p ...\n", addr);
 158                 ldr_load(addr);
 159
 160                 icache_disable();
 161                 dcache_disable();
 162
 163                 ldr_exec(addr);
 164         } else
 165                 printf("## No ldr image at address 0x%p\n", addr);
 166
 167         return 0;
 168 }
 169
 170 U_BOOT_CMD(bootldr, 2, 0, do_bootldr,
 171         "boot ldr image from memory",
 172         "[addr]\n"
 173         ""
 174 );