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- The common CFI driver provides this weak default implementation for
- flash_cmd_reset():
- void __flash_cmd_reset(flash_info_t *info)
- {
- /*
- * We do not yet know what kind of commandset to use, so we issue
- * the reset command in both Intel and AMD variants, in the hope
- * that AMD flash roms ignore the Intel command.
- */
- flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
- flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
- }
- void flash_cmd_reset(flash_info_t *info)
- __attribute__((weak,alias("__flash_cmd_reset")));
- Some flash chips seems to have trouble with this reset sequence. In this case
- the board specific code can override this weak default version with a board
- specific function. For example the digsy_mtc board equipped with the M29W128GH
- from Numonyx needs this version to function properly:
- void flash_cmd_reset(flash_info_t *info)
- {
- flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
- }
- see also:
- http://www.mail-archive.com/u-boot@lists.denx.de/msg24368.html
- Config Option
- CONFIG_SYS_MAX_FLASH_SECT: Number of sectors available on Flash device
- CONFIG_SYS_FLASH_CFI_WIDTH: Data-width of the flash device
- CONFIG_CMD_FLASH: Enables Flash command library
- CONFIG_FLASH_CFI_DRIVER: Enables CFI Flash driver
- CONFIG_FLASH_CFI_MTD: Enables MTD frame work for NOR Flash devices
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