3 * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 #include <asm/ppc4xx.h>
28 #include <asm/processor.h>
32 /* info for FLASH chips */
33 flash_info_t flash_info
[CONFIG_SYS_MAX_FLASH_BANKS
];
38 static ulong
flash_get_size(vu_long
*addr
, flash_info_t
*info
);
39 static int write_word8(flash_info_t
*info
, ulong dest
, ulong data
);
40 static int write_word32(flash_info_t
*info
, ulong dest
, ulong data
);
41 static void flash_get_offsets(ulong base
, flash_info_t
*info
);
43 unsigned long flash_init(void)
46 unsigned long size_b0
, base_b0
;
47 unsigned long size_b1
;
49 /* Init: no FLASHes known */
50 for (i
= 0; i
< CONFIG_SYS_MAX_FLASH_BANKS
; ++i
)
51 flash_info
[i
].flash_id
= FLASH_UNKNOWN
;
53 /* Get Size of Boot and Main Flashes */
54 size_b0
= flash_get_size((vu_long
*) FLASH_BASE0_PRELIM
,
56 if (flash_info
[0].flash_id
== FLASH_UNKNOWN
) {
57 printf("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
58 size_b0
, size_b0
<< 20);
62 flash_get_size((vu_long
*) FLASH_BASE1_PRELIM
,
64 if (flash_info
[1].flash_id
== FLASH_UNKNOWN
) {
65 printf("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
66 size_b1
, size_b1
<< 20);
70 /* Calculate base addresses */
73 /* Setup offsets for Boot Flash */
74 flash_get_offsets(base_b0
, &flash_info
[0]);
76 /* Protect board level data */
77 (void) flash_protect(FLAG_PROTECT_SET
,
79 flash_info
[0].start
[1] - 1, &flash_info
[0]);
81 /* Monitor protection ON by default */
82 (void) flash_protect(FLAG_PROTECT_SET
,
83 base_b0
+ size_b0
- monitor_flash_len
,
84 base_b0
+ size_b0
- 1, &flash_info
[0]);
86 /* Protect the FPGA image */
87 (void) flash_protect(FLAG_PROTECT_SET
,
89 FLASH_BASE1_PRELIM
+ CONFIG_SYS_FPGA_IMAGE_LEN
-
92 /* Protect the default boot image */
93 (void) flash_protect(FLAG_PROTECT_SET
,
94 FLASH_BASE1_PRELIM
+ CONFIG_SYS_FPGA_IMAGE_LEN
,
95 FLASH_BASE1_PRELIM
+ CONFIG_SYS_FPGA_IMAGE_LEN
+
96 0x600000 - 1, &flash_info
[1]);
98 /* Setup offsets for Main Flash */
99 flash_get_offsets(FLASH_BASE1_PRELIM
, &flash_info
[1]);
101 return size_b0
+ size_b1
;
104 static void flash_get_offsets(ulong base
, flash_info_t
*info
)
108 /* set up sector start address table - FOR BOOT ROM ONLY!!! */
109 if ((info
->flash_id
& FLASH_TYPEMASK
) == FLASH_AM040
) {
110 for (i
= 0; i
< info
->sector_count
; i
++)
111 info
->start
[i
] = base
+ (i
* 0x00010000);
113 } /* end flash_get_offsets() */
115 void flash_print_info(flash_info_t
*info
)
121 volatile unsigned long *flash
;
123 if (info
->flash_id
== FLASH_UNKNOWN
) {
124 printf("missing or unknown FLASH type\n");
128 switch (info
->flash_id
& FLASH_VENDMASK
) {
135 case FLASH_MAN_INTEL
:
136 printf("2 x Intel ");
139 printf("Unknown Vendor ");
142 switch (info
->flash_id
& FLASH_TYPEMASK
) {
144 if ((info
->flash_id
& FLASH_VENDMASK
) == FLASH_MAN_AMD
)
145 printf("AM29LV040 (4096 Kbit, uniform sector size)\n");
146 else if ((info
->flash_id
& FLASH_VENDMASK
) == FLASH_MAN_STM
)
147 printf("M29W040B (4096 Kbit, uniform block size)\n");
149 printf("UNKNOWN 29x040x (4096 Kbit, uniform sector size)\n");
151 case FLASH_28F320J3A
:
152 printf("28F320J3A (32 Mbit = 128K x 32)\n");
154 case FLASH_28F640J3A
:
155 printf("28F640J3A (64 Mbit = 128K x 64)\n");
157 case FLASH_28F128J3A
:
158 printf("28F128J3A (128 Mbit = 128K x 128)\n");
161 printf("Unknown Chip Type\n");
164 if ((info
->flash_id
& FLASH_VENDMASK
) == FLASH_MAN_STM
) {
165 printf(" Size: %ld KB in %d Blocks\n",
166 info
->size
>> 10, info
->sector_count
);
168 printf(" Size: %ld KB in %d Sectors\n",
169 info
->size
>> 10, info
->sector_count
);
172 printf(" Sector Start Addresses:");
173 for (i
= 0; i
< info
->sector_count
; ++i
) {
175 * Check if whole sector is erased
177 if (i
!= (info
->sector_count
- 1))
178 size
= info
->start
[i
+ 1] - info
->start
[i
];
180 size
= info
->start
[0] + info
->size
- info
->start
[i
];
182 flash
= (volatile unsigned long *) info
->start
[i
];
183 size
= size
>> 2; /* divide by 4 for longword access */
184 for (k
= 0; k
< size
; k
++) {
185 if (*flash
++ != 0xffffffff) {
196 info
->protect
[i
] ? "RO " : " ");
199 } /* end flash_print_info() */
202 * The following code cannot be run from FLASH!
204 static ulong
flash_get_size(vu_long
*addr
, flash_info_t
*info
)
207 ulong base
= (ulong
) addr
;
209 /* Setup default type */
210 info
->flash_id
= FLASH_UNKNOWN
;
211 info
->sector_count
= 0;
214 /* Test for Boot Flash */
215 if (base
== FLASH_BASE0_PRELIM
) {
217 volatile unsigned char *addr2
= (unsigned char *) addr
;
219 /* Write auto select command: read Manufacturer ID */
220 *(addr2
+ 0x555) = 0xaa;
221 *(addr2
+ 0x2aa) = 0x55;
222 *(addr2
+ 0x555) = 0x90;
227 case (unsigned char) AMD_MANUFACT
:
228 info
->flash_id
= FLASH_MAN_AMD
;
230 case (unsigned char) STM_MANUFACT
:
231 info
->flash_id
= FLASH_MAN_STM
;
234 *addr2
= 0xf0; /* no or unknown flash */
239 value
= *(addr2
+ 1);
241 case (unsigned char) AMD_ID_LV040B
:
242 case (unsigned char) STM_ID_29W040B
:
243 info
->flash_id
+= FLASH_AM040
;
244 info
->sector_count
= 8;
245 info
->size
= 0x00080000;
246 break; /* => 512Kb */
248 *addr2
= 0xf0; /* => no or unknown flash */
251 } else { /* MAIN Flash */
253 volatile unsigned long *addr2
= (unsigned long *) addr
;
255 /* Write auto select command: read Manufacturer ID */
261 case (unsigned long) INTEL_MANUFACT
:
262 info
->flash_id
= FLASH_MAN_INTEL
;
265 *addr2
= 0xff; /* no or unknown flash */
269 /* Device ID - This shit is interleaved... */
270 value
= *(addr2
+ 1);
272 case (unsigned long) INTEL_ID_28F320J3A
:
273 info
->flash_id
+= FLASH_28F320J3A
;
274 info
->sector_count
= 32;
275 info
->size
= 0x00400000 * 2;
276 break; /* => 2 X 4 MB */
277 case (unsigned long) INTEL_ID_28F640J3A
:
278 info
->flash_id
+= FLASH_28F640J3A
;
279 info
->sector_count
= 64;
280 info
->size
= 0x00800000 * 2;
281 break; /* => 2 X 8 MB */
282 case (unsigned long) INTEL_ID_28F128J3A
:
283 info
->flash_id
+= FLASH_28F128J3A
;
284 info
->sector_count
= 128;
285 info
->size
= 0x01000000 * 2;
286 break; /* => 2 X 16 MB */
288 *addr2
= 0xff; /* => no or unknown flash */
292 /* Make sure we don't exceed CONFIG_SYS_MAX_FLASH_SECT */
293 if (info
->sector_count
> CONFIG_SYS_MAX_FLASH_SECT
) {
294 printf("** ERROR: sector count %d > max (%d) **\n",
295 info
->sector_count
, CONFIG_SYS_MAX_FLASH_SECT
);
296 info
->sector_count
= CONFIG_SYS_MAX_FLASH_SECT
;
299 /* set up sector start address table */
300 switch (info
->flash_id
& FLASH_TYPEMASK
) {
302 for (i
= 0; i
< info
->sector_count
; i
++)
303 info
->start
[i
] = base
+ (i
* 0x00010000);
305 case FLASH_28F320J3A
:
306 case FLASH_28F640J3A
:
307 case FLASH_28F128J3A
:
308 for (i
= 0; i
< info
->sector_count
; i
++)
309 info
->start
[i
] = base
+
310 (i
* 0x00020000 * 2); /* 2 Banks */
314 /* Test for Boot Flash */
315 if (base
== FLASH_BASE0_PRELIM
) {
316 volatile unsigned char *addr2
;
318 /* check for protected sectors */
319 for (i
= 0; i
< info
->sector_count
; i
++) {
321 * read sector protection at sector address,
323 * D0 = 1 if protected
325 addr2
= (volatile unsigned char *) (info
->start
[i
]);
326 info
->protect
[i
] = *(addr2
+ 2) & 1;
329 /* Restore read mode */
330 *(unsigned char *) base
= 0xF0; /* Reset NORMAL Flash */
331 } else { /* Main Flash */
332 volatile unsigned long *addr2
;
334 /* check for protected sectors */
335 for (i
= 0; i
< info
->sector_count
; i
++) {
337 * read sector protection at sector address,
339 * D0 = 1 if protected
341 addr2
= (volatile unsigned long *) (info
->start
[i
]);
342 info
->protect
[i
] = *(addr2
+ 2) & 0x1;
345 /* Restore read mode */
346 *(unsigned long *) base
= 0xFFFFFFFF; /* Reset Flash */
350 } /* end flash_get_size() */
352 static int wait_for_DQ7(ulong addr
, uchar cmp_val
, ulong tout
)
356 volatile uchar
*vaddr
= (uchar
*) addr
;
359 for (i
= 1; i
<= (100 * tout
); i
++) { /* Wait up to tout ms */
363 /* Check for completion */
364 if ((vaddr
[0] & 0x80) == (cmp_val
& 0x80))
367 /* KEEP THE LUSER HAPPY - Print a dot every 1.1 seconds */
371 /* Kick the dog if needed */
376 } /* wait_for_DQ7() */
378 static int flash_erase8(flash_info_t
*info
, int s_first
, int s_last
)
380 int tcode
, rcode
= 0;
381 volatile uchar
*addr
= (uchar
*) (info
->start
[0]);
382 volatile uchar
*sector_addr
;
383 int flag
, prot
, sect
;
385 /* Validate arguments */
386 if ((s_first
< 0) || (s_first
> s_last
)) {
387 if (info
->flash_id
== FLASH_UNKNOWN
)
388 printf("- missing\n");
390 printf("- no sectors to erase\n");
394 /* Check for KNOWN flash type */
395 if (info
->flash_id
== FLASH_UNKNOWN
) {
396 printf("Can't erase unknown flash type - aborted\n");
400 /* Check for protected sectors */
402 for (sect
= s_first
; sect
<= s_last
; ++sect
) {
403 if (info
->protect
[sect
])
407 printf("- Warning: %d protected sectors will not be erased!\n",
413 /* Start erase on unprotected sectors */
414 for (sect
= s_first
; sect
<= s_last
; sect
++) {
415 if (info
->protect
[sect
] == 0) { /* not protected */
416 sector_addr
= (uchar
*) (info
->start
[sect
]);
418 if ((info
->flash_id
& FLASH_VENDMASK
) ==
420 printf("Erasing block %p\n", sector_addr
);
422 printf("Erasing sector %p\n", sector_addr
);
424 /* Disable interrupts which might cause timeout */
425 flag
= disable_interrupts();
427 *(addr
+ 0x555) = (uchar
) 0xAA;
428 *(addr
+ 0x2aa) = (uchar
) 0x55;
429 *(addr
+ 0x555) = (uchar
) 0x80;
430 *(addr
+ 0x555) = (uchar
) 0xAA;
431 *(addr
+ 0x2aa) = (uchar
) 0x55;
432 *sector_addr
= (uchar
) 0x30; /* sector erase */
435 * Wait for each sector to complete, it's more
436 * reliable. According to AMD Spec, you must
437 * issue all erase commands within a specified
438 * timeout. This has been seen to fail, especially
439 * if printf()s are included (for debug)!!
440 * Takes up to 6 seconds.
442 tcode
= wait_for_DQ7((ulong
) sector_addr
, 0x80, 6000);
444 /* re-enable interrupts if necessary */
448 /* Make sure we didn't timeout */
456 /* wait at least 80us - let's wait 1 ms */
459 /* reset to read mode */
460 addr
= (uchar
*) info
->start
[0];
461 *addr
= (uchar
) 0xF0; /* reset bank */
465 } /* end flash_erase8() */
467 static int flash_erase32(flash_info_t
*info
, int s_first
, int s_last
)
470 ulong start
, now
, last
;
473 /* Validate arguments */
474 if ((s_first
< 0) || (s_first
> s_last
)) {
475 if (info
->flash_id
== FLASH_UNKNOWN
)
476 printf("- missing\n");
478 printf("- no sectors to erase\n");
482 /* Check for KNOWN flash type */
483 if ((info
->flash_id
& FLASH_VENDMASK
) != FLASH_MAN_INTEL
) {
484 printf("Can erase only Intel flash types - aborted\n");
488 /* Check for protected sectors */
489 for (sect
= s_first
; sect
<= s_last
; ++sect
) {
490 if (info
->protect
[sect
])
494 printf("- Warning: %d protected sectors will not be erased!\n",
500 start
= get_timer(0);
502 /* Start erase on unprotected sectors */
503 for (sect
= s_first
; sect
<= s_last
; sect
++) {
505 if (info
->protect
[sect
] == 0) { /* not protected */
506 vu_long
*addr
= (vu_long
*) (info
->start
[sect
]);
507 unsigned long status
;
509 /* Disable interrupts which might cause a timeout */
510 flag
= disable_interrupts();
512 *addr
= 0x00500050; /* clear status register */
513 *addr
= 0x00200020; /* erase setup */
514 *addr
= 0x00D000D0; /* erase confirm */
516 /* re-enable interrupts if necessary */
520 /* Wait at least 80us - let's wait 1 ms */
523 while (((status
= *addr
) & 0x00800080) != 0x00800080) {
524 now
= get_timer(start
);
525 if (now
> CONFIG_SYS_FLASH_ERASE_TOUT
) {
529 /* reset to read mode */
535 * show that we're waiting
538 if ((now
- last
) > 990) {
543 *addr
= 0x00FF00FF; /* reset to read mode */
550 int flash_erase(flash_info_t
*info
, int s_first
, int s_last
)
552 if ((info
->flash_id
& FLASH_TYPEMASK
) == FLASH_AM040
)
553 return flash_erase8(info
, s_first
, s_last
);
555 return flash_erase32(info
, s_first
, s_last
);
559 * Copy memory to flash, returns:
562 * 2 - Flash not erased
564 static int write_buff8(flash_info_t
*info
, uchar
*src
, ulong addr
,
571 start
= get_timer(0);
573 wp
= (addr
& ~3); /* get lower word
577 * handle unaligned start bytes
582 for (i
= 0, cp
= wp
; i
< l
; ++i
, ++cp
)
583 data
= (data
<< 8) | (*(uchar
*) cp
);
585 for (; i
< 4 && cnt
> 0; ++i
) {
586 data
= (data
<< 8) | *src
++;
591 for (; cnt
== 0 && i
< 4; ++i
, ++cp
)
592 data
= (data
<< 8) | (*(uchar
*) cp
);
594 rc
= write_word8(info
, wp
, data
);
602 * handle word aligned part
606 for (i
= 0; i
< 4; ++i
)
607 data
= (data
<< 8) | *src
++;
609 rc
= write_word8(info
, wp
, data
);
615 if (get_timer(start
) > 1000) { /* every second */
618 start
= get_timer(0);
626 * handle unaligned tail bytes
629 for (i
= 0, cp
= wp
; i
< 4 && cnt
> 0; ++i
, ++cp
) {
630 data
= (data
<< 8) | *src
++;
634 for (; i
< 4; ++i
, ++cp
)
635 data
= (data
<< 8) | (*(uchar
*) cp
);
637 return write_word8(info
, wp
, data
);
640 #define FLASH_WIDTH 4 /* flash bus width in bytes */
641 static int write_buff32(flash_info_t
*info
, uchar
*src
, ulong addr
,
648 start
= get_timer(0);
650 if (info
->flash_id
== FLASH_UNKNOWN
)
653 /* get lower FLASH_WIDTH aligned address */
654 wp
= (addr
& ~(FLASH_WIDTH
- 1));
657 * handle unaligned start bytes
659 if ((l
= addr
- wp
) != 0) {
661 for (i
= 0, cp
= wp
; i
< l
; ++i
, ++cp
)
662 data
= (data
<< 8) | (*(uchar
*) cp
);
664 for (; i
< FLASH_WIDTH
&& cnt
> 0; ++i
) {
665 data
= (data
<< 8) | *src
++;
670 for (; cnt
== 0 && i
< FLASH_WIDTH
; ++i
, ++cp
)
671 data
= (data
<< 8) | (*(uchar
*) cp
);
673 rc
= write_word32(info
, wp
, data
);
681 * handle FLASH_WIDTH aligned part
683 while (cnt
>= FLASH_WIDTH
) {
685 for (i
= 0; i
< FLASH_WIDTH
; ++i
)
686 data
= (data
<< 8) | *src
++;
688 rc
= write_word32(info
, wp
, data
);
694 if (get_timer(start
) > 990) { /* every second */
696 start
= get_timer(0);
704 * handle unaligned tail bytes
707 for (i
= 0, cp
= wp
; i
< FLASH_WIDTH
&& cnt
> 0; ++i
, ++cp
) {
708 data
= (data
<< 8) | *src
++;
712 for (; i
< FLASH_WIDTH
; ++i
, ++cp
)
713 data
= (data
<< 8) | (*(uchar
*) cp
);
715 return write_word32(info
, wp
, data
);
718 int write_buff(flash_info_t
*info
, uchar
*src
, ulong addr
, ulong cnt
)
722 if ((info
->flash_id
& FLASH_TYPEMASK
) == FLASH_AM040
)
723 retval
= write_buff8(info
, src
, addr
, cnt
);
725 retval
= write_buff32(info
, src
, addr
, cnt
);
731 * Write a word to Flash, returns:
734 * 2 - Flash not erased
737 static int write_word8(flash_info_t
*info
, ulong dest
, ulong data
)
739 volatile uchar
*addr2
= (uchar
*) (info
->start
[0]);
740 volatile uchar
*dest2
= (uchar
*) dest
;
741 volatile uchar
*data2
= (uchar
*) &data
;
743 int i
, tcode
, rcode
= 0;
745 /* Check if Flash is (sufficently) erased */
746 if ((*((volatile uchar
*)dest
) & (uchar
)data
) != (uchar
)data
)
749 for (i
= 0; i
< (4 / sizeof(uchar
)); i
++) {
750 /* Disable interrupts which might cause a timeout here */
751 flag
= disable_interrupts();
753 *(addr2
+ 0x555) = (uchar
) 0xAA;
754 *(addr2
+ 0x2aa) = (uchar
) 0x55;
755 *(addr2
+ 0x555) = (uchar
) 0xA0;
759 /* Wait for write to complete, up to 1ms */
760 tcode
= wait_for_DQ7((ulong
) &dest2
[i
], data2
[i
], 1);
762 /* re-enable interrupts if necessary */
766 /* Make sure we didn't timeout */
774 static int write_word32(flash_info_t
*info
, ulong dest
, ulong data
)
776 vu_long
*addr
= (vu_long
*) dest
;
781 /* Check if Flash is (sufficiently) erased */
782 if ((*addr
& data
) != data
)
785 /* Disable interrupts which might cause a timeout here */
786 flag
= disable_interrupts();
788 *addr
= 0x00400040; /* write setup */
791 /* re-enable interrupts if necessary */
795 start
= get_timer(0);
797 while (((status
= *addr
) & 0x00800080) != 0x00800080) {
799 if (get_timer(start
) > CONFIG_SYS_FLASH_WRITE_TOUT
) {
800 *addr
= 0x00FF00FF; /* restore read mode */
805 *addr
= 0x00FF00FF; /* restore read mode */
810 static int _flash_protect(flash_info_t
*info
, long sector
)
816 volatile long *addr
= (long *)sector
;
818 switch (info
->flash_id
& FLASH_TYPEMASK
) {
819 case FLASH_28F320J3A
:
820 case FLASH_28F640J3A
:
821 case FLASH_28F128J3A
:
822 /* Disable interrupts which might cause Flash to timeout */
823 flag
= disable_interrupts();
826 *addr
= 0x00500050L
; /* Clear the status register */
827 *addr
= 0x00600060L
; /* Set lock bit setup */
828 *addr
= 0x00010001L
; /* Set lock bit confirm */
830 /* Wait for command completion */
831 for (i
= 0; i
< 10; i
++) { /* 75us timeout, wait 100us */
833 if ((*addr
& 0x00800080L
) == 0x00800080L
)
837 /* Not successful? */
839 if (status
!= 0x00800080L
) {
840 printf("Protect %x sector failed: %x\n",
841 (uint
) sector
, (uint
) status
);
845 /* Restore read mode */
848 /* re-enable interrupts if necessary */
853 case FLASH_AM040
: /* No soft sector protection */
857 /* Turn protection on for this sector */
858 for (i
= 0; i
< info
->sector_count
; i
++) {
859 if (info
->start
[i
] == sector
) {
860 info
->protect
[i
] = 1;
868 static int _flash_unprotect(flash_info_t
*info
, long sector
)
874 volatile long *addr
= (long *) sector
;
876 switch (info
->flash_id
& FLASH_TYPEMASK
) {
877 case FLASH_28F320J3A
:
878 case FLASH_28F640J3A
:
879 case FLASH_28F128J3A
:
880 /* Disable interrupts which might cause Flash to timeout */
881 flag
= disable_interrupts();
883 *addr
= 0x00500050L
; /* Clear the status register */
884 *addr
= 0x00600060L
; /* Clear lock bit setup */
885 *addr
= 0x00D000D0L
; /* Clear lock bit confirm */
887 /* Wait for command completion */
888 for (i
= 0; i
< 80; i
++) { /* 700ms timeout, wait 800 */
889 udelay(10000); /* Delay 10ms */
890 if ((*addr
& 0x00800080L
) == 0x00800080L
)
894 /* Not successful? */
896 if (status
!= 0x00800080L
) {
897 printf("Un-protect %x sector failed: %x\n",
898 (uint
) sector
, (uint
) status
);
903 /* restore read mode */
906 /* re-enable interrupts if necessary */
911 case FLASH_AM040
: /* No soft sector protection */
916 * Fix Intel's little red wagon. Reprotect
917 * sectors that were protected before we undid
918 * protection on a specific sector.
920 for (i
= 0; i
< info
->sector_count
; i
++) {
921 if (info
->start
[i
] != sector
) {
922 if (info
->protect
[i
]) {
923 if (_flash_protect(info
, info
->start
[i
]))
926 } else /* Turn protection off for this sector */
927 info
->protect
[i
] = 0;
933 int flash_real_protect(flash_info_t
*info
, long sector
, int prot
)
938 rcode
= _flash_protect(info
, info
->start
[sector
]);
940 rcode
= _flash_unprotect(info
, info
->start
[sector
]);