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doc/README.cfi
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The common CFI driver provides this weak default implementation for flash_cmd_reset(): |
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static void __flash_cmd_reset(flash_info_t *info) |
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{ /* * 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); |
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udelay(1); |
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flash_write_cmd(info, 0, 0, FLASH_CMD_RESET); } void flash_cmd_reset(flash_info_t *info) __attribute__((weak,alias("__flash_cmd_reset"))); |
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Some flash chips seem to have trouble with this reset sequence. In this case, board-specific code can override this weak default version with a board-specific function. |
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At the time of writing, there are two boards that define their own routine for this. First, the digsy_mtc board equipped with the M29W128GH from Numonyx needs this version to function properly: |
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void flash_cmd_reset(flash_info_t *info) { flash_write_cmd(info, 0, 0, AMD_CMD_RESET); } |
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In addition, the t3corp board defines the routine thusly: void flash_cmd_reset(flash_info_t *info) { /* * FLASH at address CONFIG_SYS_FLASH_BASE is a Spansion chip and * needs the Spansion type reset commands. The other flash chip * is located behind a FPGA (Xilinx DS617) and needs the Intel type * reset command. */ if (info->start[0] == CONFIG_SYS_FLASH_BASE) flash_write_cmd(info, 0, 0, AMD_CMD_RESET); else flash_write_cmd(info, 0, 0, FLASH_CMD_RESET); } |
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see also: http://www.mail-archive.com/u-boot@lists.denx.de/msg24368.html |
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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 |