65cc0e2a65
The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do not easily transition to Kconfig. In many cases they likely should come from the device tree instead. Move these out of CONFIG namespace and in to CFG namespace. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
64 lines
1.8 KiB
Plaintext
64 lines
1.8 KiB
Plaintext
The common CFI driver provides this weak default implementation for
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flash_cmd_reset():
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static void __flash_cmd_reset(flash_info_t *info)
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{
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/*
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* We do not yet know what kind of commandset to use, so we issue
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* the reset command in both Intel and AMD variants, in the hope
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* that AMD flash roms ignore the Intel command.
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*/
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flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
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udelay(1);
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flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
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}
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void flash_cmd_reset(flash_info_t *info)
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__attribute__((weak,alias("__flash_cmd_reset")));
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Some flash chips seem to have trouble with this reset sequence.
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In this case, board-specific code can override this weak default
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version with a board-specific function.
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At the time of writing, there are two boards that define their own
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routine for this.
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First, the digsy_mtc board equipped with the M29W128GH from Numonyx
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needs this version to function properly:
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void flash_cmd_reset(flash_info_t *info)
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{
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flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
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}
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In addition, the t3corp board defines the routine thusly:
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void flash_cmd_reset(flash_info_t *info)
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{
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/*
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* FLASH at address CFG_SYS_FLASH_BASE is a Spansion chip and
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* needs the Spansion type reset commands. The other flash chip
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* is located behind a FPGA (Xilinx DS617) and needs the Intel type
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* reset command.
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*/
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if (info->start[0] == CFG_SYS_FLASH_BASE)
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flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
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else
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flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
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}
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see also:
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http://www.mail-archive.com/u-boot@lists.denx.de/msg24368.html
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Config Option
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CONFIG_SYS_MAX_FLASH_SECT: Number of sectors available on Flash device
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CONFIG_SYS_FLASH_CFI_WIDTH: Data-width of the flash device
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CONFIG_CMD_FLASH: Enables Flash command library
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CONFIG_FLASH_CFI_DRIVER: Enables CFI Flash driver
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CONFIG_FLASH_CFI_MTD: Enables MTD frame work for NOR Flash devices
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