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此處，只是簡(jiǎn)單介紹一下，我之前所遇到的一個(gè)nor flash驅(qū)動(dòng)，是如何做的。

關(guān)于添加nor flash初始化的代碼，其實(shí)很簡(jiǎn)單，就是在開發(fā)板的最核心的那個(gè)文件（此處以arm系統(tǒng)為例）：

linux-2.6.28.4\arch\arm\mach-XXX\core.c

中，添加類似于這樣的代碼：

static const struct spi_board_info const XXX_spi_devices[] = { { /* SSP NOR Flash chip */ .modalias = "ssp_nor", .chip_select = XXX_SPI_NOR_CS, .max_speed_hz = 20 * 1000 * 1000, .bus_num = 1, },......};

然后在自己開發(fā)板設(shè)備初始化的部分，添加對(duì)應(yīng)spi nor設(shè)備的注冊(cè)函數(shù)：

spi_register_board_info(XXX_spi_devices, ARRAY_SIZE(XXX_spi_devices));

以實(shí)現(xiàn)對(duì)應(yīng)的spi接口的nor flash設(shè)備的注冊(cè)和添加。

具體內(nèi)部邏輯是如何實(shí)現(xiàn)的，就要自己去看代碼了。

此處只是給個(gè)框架，告訴你大概是怎么去實(shí)現(xiàn)的，具體的實(shí)現(xiàn)，肯定要你自己去看代碼搞懂。

在spi接口的nor flash設(shè)備注冊(cè)部分搞定后，再來看Linux中的，默認(rèn)已經(jīng)幫我們實(shí)現(xiàn)好了的一個(gè)通用的nor flash的驅(qū)動(dòng)。

具體的文件是：

linux-2.6.28.4\drivers\mtd\devices\m25p80.c

其中，對(duì)于支持的設(shè)備，可以去看源碼中的設(shè)備列表部分的代碼：

/* NOTE: double check command sets and memory organization when you add * more flash chips. This current list focusses on newer chips, which * have been converging on command sets which including JEDEC ID. */static struct flash_info __devinitdata m25p_data [] = { /* Atmel -- some are (confusingly) marketed as "DataFlash" */ { "at25fs010", 0x1f6601, 0, 32 * 1024, 4, SECT_4K, }, { "at25fs040", 0x1f6604, 0, 64 * 1024, 8, SECT_4K, }, { "at25df041a", 0x1f4401, 0, 64 * 1024, 8, SECT_4K, }, { "at25df641", 0x1f4800, 0, 64 * 1024, 128, SECT_4K, }, { "at26f004", 0x1f0400, 0, 64 * 1024, 8, SECT_4K, }, { "at26df081a", 0x1f4501, 0, 64 * 1024, 16, SECT_4K, }, { "at26df161a", 0x1f4601, 0, 64 * 1024, 32, SECT_4K, }, { "at26df321", 0x1f4701, 0, 64 * 1024, 64, SECT_4K, }, /* Spansion -- single (large) sector size only, at least * for the chips listed here (without boot sectors). */ { "s25sl004a", 0x010212, 0, 64 * 1024, 8, }, { "s25sl008a", 0x010213, 0, 64 * 1024, 16, }, { "s25sl016a", 0x010214, 0, 64 * 1024, 32, }, { "s25sl032a", 0x010215, 0, 64 * 1024, 64, }, { "s25sl064a", 0x010216, 0, 64 * 1024, 128, }, { "s25sl12800", 0x012018, 0x0300, 256 * 1024, 64, }, { "s25sl12801", 0x012018, 0x0301, 64 * 1024, 256, }, /* SST -- large erase sizes are "overlays", "sectors" are 4K */ { "sst25vf040b", 0xbf258d, 0, 64 * 1024, 8, SECT_4K, }, { "sst25vf080b", 0xbf258e, 0, 64 * 1024, 16, SECT_4K, }, { "sst25vf016b", 0xbf2541, 0, 64 * 1024, 32, SECT_4K, }, { "sst25vf032b", 0xbf254a, 0, 64 * 1024, 64, SECT_4K, }, /* ST Microelectronics -- newer production may have feature updates */ { "m25p05", 0x202010, 0, 32 * 1024, 2, }, { "m25p10", 0x202011, 0, 32 * 1024, 4, }, { "m25p20", 0x202012, 0, 64 * 1024, 4, }, { "m25p40", 0x202013, 0, 64 * 1024, 8, }, { "m25p80", 0, 0, 64 * 1024, 16, }, { "m25p16", 0x202015, 0, 64 * 1024, 32, }, { "m25p32", 0x202016, 0, 64 * 1024, 64, }, { "m25p64", 0x202017, 0, 64 * 1024, 128, }, { "m25p128", 0x202018, 0, 256 * 1024, 64, }, { "m45pe80", 0x204014, 0, 64 * 1024, 16, }, { "m45pe16", 0x204015, 0, 64 * 1024, 32, }, { "m25pe80", 0x208014, 0, 64 * 1024, 16, }, { "m25pe16", 0x208015, 0, 64 * 1024, 32, SECT_4K, }, /* Winbond -- w25x "blocks" are 64K, "sectors" are 4KiB */ { "w25x10", 0xef3011, 0, 64 * 1024, 2, SECT_4K, }, { "w25x20", 0xef3012, 0, 64 * 1024, 4, SECT_4K, }, { "w25x40", 0xef3013, 0, 64 * 1024, 8, SECT_4K, }, { "w25x80", 0xef3014, 0, 64 * 1024, 16, SECT_4K, }, { "w25x16", 0xef3015, 0, 64 * 1024, 32, SECT_4K, }, { "w25x32", 0xef3016, 0, 64 * 1024, 64, SECT_4K, }, { "w25x64", 0xef3017, 0, 64 * 1024, 128, SECT_4K, },};

如果要添加此驅(qū)動(dòng)，以實(shí)現(xiàn)支持我們的通用的nor flash，則在make menuconfig的時(shí)候，添加對(duì)應(yīng)設(shè)備的支持即可。

對(duì)應(yīng)選項(xiàng)的kconfig的配置內(nèi)容在：

linux-2.6.28.4\drivers\mtd\devices\kconfig

中：

config MTD_M25P80 tristate "Support most SPI Flash chips (AT26DF, M25P, W25X, ...)" depends on SPI_MASTER && EXPERIMENTAL help This enables access to most modern SPI flash chips, used for program and data storage. Series supported include Atmel AT26DF, Spansion S25SL, SST 25VF, ST M25P, and Winbond W25X. Other chips are supported as well. See the driver source for the current list, or to add other chips. Note that the original DataFlash chips (AT45 series, not AT26DF), need an entirely different driver. Set up your spi devices with the right board-specific platform data, if you want to specify device partitioning or to use a device which doesn't support the JEDEC ID instruction.

如上所述，如果這些步驟都做完了，最后新編譯生成的linux內(nèi)核，運(yùn)行后，就應(yīng)該可以可以通過：

cat /proc/mtd

查看到對(duì)應(yīng)的mtd設(shè)備了。如果沒有，那么說明你的驅(qū)動(dòng)還是沒有添加正常。