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flash/nor/cfi: fix TopBottom for atmel chips 

There are some older atmel nor chips which have negated logic for
TopBottom detection. This patch adds a special handling for the old
chips. This is the same mechanism as implemented in linux kernel.

Signed-off-by: Andreas Bießmann <andreas.devel@gmail.com>
This commit is contained in:
Andreas Bießmann 2011-07-12 12:38:22 +02:00 committed by Øyvind Harboe
parent 7d2bf8805d
commit 6e5c37be29
1 changed files with 17 additions and 4 deletions
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21
src/flash/nor/cfi.c
View File

@ -42,6 +42,10 @@
/* defines internal maximum size for code fragment in cfi_intel_write_block() */
#define CFI_MAX_INTEL_CODESIZE 256
/* some id-types with specific handling */
#define AT49BV6416 0x00d6
#define AT49BV6416T 0x00d2
static struct cfi_unlock_addresses cfi_unlock_addresses[] =
{
[CFI_UNLOCK_555_2AA] = { .unlock1 = 0x555, .unlock2 = 0x2aa },
@ -700,10 +704,19 @@ static int cfi_read_atmel_pri_ext(struct flash_bank *bank)
if (atmel_pri_ext.features & 0x02)
pri_ext->EraseSuspend = 2;
if (atmel_pri_ext.bottom_boot)
pri_ext->TopBottom = 2;
else
pri_ext->TopBottom = 3;
/* some chips got it backwards... */
if (cfi_info->device_id == AT49BV6416 ||
cfi_info->device_id == AT49BV6416T) {
if (atmel_pri_ext.bottom_boot)
pri_ext->TopBottom = 3;
else
pri_ext->TopBottom = 2;
} else {
if (atmel_pri_ext.bottom_boot)
pri_ext->TopBottom = 2;
else
pri_ext->TopBottom = 3;
}
pri_ext->_unlock1 = cfi_unlock_addresses[CFI_UNLOCK_555_2AA].unlock1;
pri_ext->_unlock2 = cfi_unlock_addresses[CFI_UNLOCK_555_2AA].unlock2;