diff options
author | Esben Haabendal <esben@haabendal.dk> | 2015-11-27 09:13:36 +0100 |
---|---|---|
committer | Paul Fertser <fercerpav@gmail.com> | 2016-06-23 07:39:57 +0100 |
commit | 12ff09f7f27a707fe42226262f55b8ce8351cbf9 (patch) | |
tree | b8c6b35881a40842ac91e0482a5f45605f9adff6 /src | |
parent | f906c65fed5f3f2df54c6aaf2ea28d9742d44db4 (diff) |
cfi: Add support for strangely endianness broken SoC implementations
This adds the 'data_swap' parameter to the CFI driver, which enables
swapping of data bytes when writing/programming words to the flash.
Note, that this specifically means that bytes are not swapped when
writing command words to the flash chip. Unless you are using the SAP
in an LS102x chip to program an attached 16-bit NOR flash, you hopefully
do not need this!
Change-Id: I1e6f7169da36f373c880d1756d9c21c9957acc50
Signed-off-by: Esben Haabendal <esben@haabendal.dk>
Reviewed-on: http://openocd.zylin.com/3109
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
Diffstat (limited to 'src')
-rw-r--r-- | src/flash/nor/cfi.c | 42 | ||||
-rw-r--r-- | src/flash/nor/cfi.h | 1 |
2 files changed, 40 insertions, 3 deletions
diff --git a/src/flash/nor/cfi.c b/src/flash/nor/cfi.c index 248f7600..f7d8a90f 100644 --- a/src/flash/nor/cfi.c +++ b/src/flash/nor/cfi.c @@ -834,10 +834,13 @@ FLASH_BANK_COMMAND_HANDLER(cfi_flash_bank_command) cfi_info->x16_as_x8 = 0; cfi_info->jedec_probe = 0; cfi_info->not_cfi = 0; + cfi_info->data_swap = 0; for (unsigned i = 6; i < CMD_ARGC; i++) { if (strcmp(CMD_ARGV[i], "x16_as_x8") == 0) cfi_info->x16_as_x8 = 1; + else if (strcmp(CMD_ARGV[i], "data_swap") == 0) + cfi_info->data_swap = 1; else if (strcmp(CMD_ARGV[i], "bus_swap") == 0) bus_swap = 1; else if (strcmp(CMD_ARGV[i], "jedec_probe") == 0) @@ -2331,6 +2334,8 @@ static int cfi_write(struct flash_bank *bank, const uint8_t *buffer, uint32_t of int blk_count; /* number of bus_width bytes for block copy */ uint8_t current_word[CFI_MAX_BUS_WIDTH * 4]; /* word (bus_width size) currently being *programmed */ + uint8_t *swapped_buffer = NULL; + const uint8_t *real_buffer = NULL; int i; int retval; @@ -2357,8 +2362,14 @@ static int cfi_write(struct flash_bank *bank, const uint8_t *buffer, uint32_t of return retval; /* replace only bytes that must be written */ - for (i = align; (i < bank->bus_width) && (count > 0); i++, count--) - current_word[i] = *buffer++; + for (i = align; + (i < bank->bus_width) && (count > 0); + i++, count--) + if (cfi_info->data_swap) + /* data bytes are swapped (reverse endianness) */ + current_word[bank->bus_width - i] = *buffer++; + else + current_word[i] = *buffer++; retval = cfi_write_word(bank, current_word, write_p); if (retval != ERROR_OK) @@ -2366,6 +2377,22 @@ static int cfi_write(struct flash_bank *bank, const uint8_t *buffer, uint32_t of write_p += bank->bus_width; } + if (cfi_info->data_swap && count) { + swapped_buffer = malloc(count & ~(bank->bus_width - 1)); + switch (bank->bus_width) { + case 2: + buf_bswap16(swapped_buffer, buffer, + count & ~(bank->bus_width - 1)); + break; + case 4: + buf_bswap32(swapped_buffer, buffer, + count & ~(bank->bus_width - 1)); + break; + } + real_buffer = buffer; + buffer = swapped_buffer; + } + /* handle blocks of bus_size aligned bytes */ blk_count = count & ~(bank->bus_width - 1); /* round down, leave tail bytes */ switch (cfi_info->pri_id) { @@ -2435,6 +2462,11 @@ static int cfi_write(struct flash_bank *bank, const uint8_t *buffer, uint32_t of return retval; } + if (swapped_buffer) { + buffer = real_buffer + (buffer - swapped_buffer); + free(swapped_buffer); + } + /* return to read array mode, so we can read from flash again for padding */ retval = cfi_reset(bank); if (retval != ERROR_OK) @@ -2451,7 +2483,11 @@ static int cfi_write(struct flash_bank *bank, const uint8_t *buffer, uint32_t of /* replace only bytes that must be written */ for (i = 0; (i < bank->bus_width) && (count > 0); i++, count--) - current_word[i] = *buffer++; + if (cfi_info->data_swap) + /* data bytes are swapped (reverse endianness) */ + current_word[bank->bus_width - i] = *buffer++; + else + current_word[i] = *buffer++; retval = cfi_write_word(bank, current_word, write_p); if (retval != ERROR_OK) diff --git a/src/flash/nor/cfi.h b/src/flash/nor/cfi.h index 1eb65f90..ed858a9d 100644 --- a/src/flash/nor/cfi.h +++ b/src/flash/nor/cfi.h @@ -29,6 +29,7 @@ struct cfi_flash_bank { int probed; enum target_endianness endianness; + int data_swap; uint16_t manufacturer; uint16_t device_id; |