mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
3df3bc1e1d
This patch adds support of NOR cape[1] for both Beaglebone (white) and Beaglebone(Black) boards. NOR Flash on this cape is connected to GPMC chip-select[0] and accesses as external memory-mapped device. This cape has 128Mbits(16MBytes), x16, CFI compatible NOR Flash device. As GPMC chip-select[0] can be shared by multiple capes so NOR profile is not enabled by default in boards.cfg. Following changes are required to enable NOR cape detection when building am335x_boneblack board profile. Signed-off-by: Tom Rini <trini@ti.com>
43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
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
|