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1The common CFI driver provides this weak default implementation for
2flash_cmd_reset():
3
4void __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}
14void flash_cmd_reset(flash_info_t *info)
15 __attribute__((weak,alias("__flash_cmd_reset")));
16
17
18Some flash chips seems to have trouble with this reset sequence. In this case
19the board specific code can override this weak default version with a board
20specific function. For example the digsy_mtc board equipped with the M29W128GH
21from Numonyx needs this version to function properly:
22
23void flash_cmd_reset(flash_info_t *info)
24{
25 flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
26}
27
28see also:
29http://www.mail-archive.com/u-boot@lists.denx.de/msg24368.html
3df3bc1e 30
31
32Config 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