| Heiko Schocher | 13f805e | 2011-01-13 08:25:00 +0100 | [diff] [blame] | 1 | The common CFI driver provides this weak default implementation for |
| 2 | flash_cmd_reset(): |
| 3 | |
| 4 | void __flash_cmd_reset(flash_info_t *info) |
| 5 | { |
| 6 | /* |
| 7 | * We do not yet know what kind of commandset to use, so we issue |
| 8 | * the reset command in both Intel and AMD variants, in the hope |
| 9 | * that AMD flash roms ignore the Intel command. |
| 10 | */ |
| 11 | flash_write_cmd(info, 0, 0, AMD_CMD_RESET); |
| 12 | flash_write_cmd(info, 0, 0, FLASH_CMD_RESET); |
| 13 | } |
| 14 | void flash_cmd_reset(flash_info_t *info) |
| 15 | __attribute__((weak,alias("__flash_cmd_reset"))); |
| 16 | |
| 17 | |
| 18 | Some flash chips seems to have trouble with this reset sequence. In this case |
| 19 | the board specific code can override this weak default version with a board |
| 20 | specific function. For example the digsy_mtc board equipped with the M29W128GH |
| 21 | from Numonyx needs this version to function properly: |
| 22 | |
| 23 | void flash_cmd_reset(flash_info_t *info) |
| 24 | { |
| 25 | flash_write_cmd(info, 0, 0, AMD_CMD_RESET); |
| 26 | } |
| 27 | |
| 28 | see also: |
| 29 | http://www.mail-archive.com/u-boot@lists.denx.de/msg24368.html |
| pekon gupta | 0efbdcf | 2014-07-22 16:03:21 +0530 | [diff] [blame] | 30 | |
| 31 | |
| 32 | Config Option |
| 33 | |
| 34 | CONFIG_SYS_MAX_FLASH_SECT: Number of sectors available on Flash device |
| 35 | |
| 36 | CONFIG_SYS_FLASH_CFI_WIDTH: Data-width of the flash device |
| 37 | |
| 38 | CONFIG_CMD_FLASH: Enables Flash command library |
| 39 | |
| 40 | CONFIG_FLASH_CFI_DRIVER: Enables CFI Flash driver |
| 41 | |
| 42 | CONFIG_FLASH_CFI_MTD: Enables MTD frame work for NOR Flash devices |