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Verify_range() and check_erased_range() check each page separately.
While that may have seemed like a good idea back when the code was
introduced, it has no benefits for any of the chips where we support
write because all of them handle cross-page reads nicely.
The only class of chips where this change could be a problem is chips
with non power of two sector sizes which have gaps in the address space.
We simply require their read functions to provide gap-free results
and leave it at that.

Corresponding to flashrom svn r1233.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
This commit is contained in:
Carl-Daniel Hailfinger 2010-11-16 17:21:58 +00:00
parent 2bee8cf898
commit d836941f9e
1 changed files with 17 additions and 33 deletions
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50
flashrom.c
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@ -726,9 +726,8 @@ int check_erased_range(struct flashchip *flash, int start, int len)
*/
int verify_range(struct flashchip *flash, uint8_t *cmpbuf, int start, int len, char *message)
{
int i, j, starthere, lenhere, ret = 0;
int page_size = flash->page_size;
uint8_t *readbuf = malloc(page_size);
int i, ret = 0;
uint8_t *readbuf = malloc(len);
int failcount = 0;
if (!len)
@ -753,36 +752,21 @@ int verify_range(struct flashchip *flash, uint8_t *cmpbuf, int start, int len, c
if (!message)
message = "VERIFY";
/* Warning: This loop has a very unusual condition and body.
* The loop needs to go through each page with at least one affected
* byte. The lowest page number is (start / page_size) since that
* division rounds down. The highest page number we want is the page
* where the last byte of the range lives. That last byte has the
* address (start + len - 1), thus the highest page number is
* (start + len - 1) / page_size. Since we want to include that last
* page as well, the loop condition uses <=.
*/
for (i = start / page_size; i <= (start + len - 1) / page_size; i++) {
/* Byte position of the first byte in the range in this page. */
starthere = max(start, i * page_size);
/* Length of bytes in the range in this page. */
lenhere = min(start + len, (i + 1) * page_size) - starthere;
ret = flash->read(flash, readbuf, starthere, lenhere);
if (ret) {
msg_gerr("Verification impossible because read failed "
"at 0x%x (len 0x%x)\n", starthere, lenhere);
break;
}
for (j = 0; j < lenhere; j++) {
if (cmpbuf[starthere - start + j] != readbuf[j]) {
/* Only print the first failure. */
if (!failcount++)
msg_cerr("%s FAILED at 0x%08x! "
"Expected=0x%02x, Read=0x%02x,",
message, starthere + j,
cmpbuf[starthere - start + j],
readbuf[j]);
}
ret = flash->read(flash, readbuf, start, len);
if (ret) {
msg_gerr("Verification impossible because read failed "
"at 0x%x (len 0x%x)\n", start, len);
return ret;
}
for (i = 0; i < len; i++) {
if (cmpbuf[i] != readbuf[i]) {
/* Only print the first failure. */
if (!failcount++)
msg_cerr("%s FAILED at 0x%08x! "
"Expected=0x%02x, Read=0x%02x,",
message, start + i, cmpbuf[i],
readbuf[i]);
}
}
if (failcount) {