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一、移植环境
主 机：Fedora 14 （kernel-2.6.33.7）
开发板：FL2440(nandflash:K9F1G08
128MB)
编译器：arm-linux-gcc-4.3.2
二、移植步骤 1. 添加SD卡设备到系统设备初始化列表中。2.6.30.4内核对MMC/SD卡的支持已经非常完善了，而且支持超大容量32GB，所以这里我们只需把s3c_device_sdi添加到列表中即可。
- #vim arch/arm/mach-s3c2410/mach-smdk2410.c
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static struct platform_device *smdk2410_devices[] __initdata = {
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&s3c_device_usb,
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&s3c_device_sdi, //SD/MMC
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&s3c_device_lcd,
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&s3c_device_wdt,
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&s3c_device_i2c0,
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&s3c_device_iis,
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&s3c_device_rtc,
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&s3c24xx_uda134x, //uda
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&s3c_device_dm9000,
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};
2. 修改MMC/SD驱动源码。主要是添加SD卡的中断处理，去掉驱动的Bug和一些多余的调试信息
- vim drivers/mmc/host/s3cmci.c
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static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
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.gpio_detect = S3C2410_GPG(8),
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.gpio_wprotect = S3C2410_GPH(8),
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.set_power = NULL,
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.ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34,
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};
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static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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{
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....
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/* Set CLOCK_ENABLE */
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if (ios->clock)
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mci_con |= S3C2410_SDICON_CLOCKTYPE;
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else
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mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
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writel(mci_con, host->base + S3C2410_SDICON);
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if ((ios->power_mode == MMC_POWER_ON) ||
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(ios->power_mode == MMC_POWER_UP)) {
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//dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
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// host->real_rate/1000, ios->clock/1000);
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} else {
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dbg(host, dbg_conf, "powered down.\n");
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}
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host->bus_width = ios->bus_width;
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....
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}
3. 修改内核配置选项。完成后重新编译内核下载到开发板上
- Device Drivers --->
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<*> MMC/SD/SDIO card support --->
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--- MMC/SD/SDIO card support
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[ ] MMC debugging
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[ ] Allow unsafe resume (DANGEROUS)
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*** MMC/SD/SDIO Card Drivers ***
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<*> MMC block device driver
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[*] Use bounce buffer for simple hosts
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< > SDIO UART/GPS class support
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< > MMC host test driver
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*** MMC/SD/SDIO Host Controller Drivers ***
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< > Secure Digital Host Controller Interface support
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< > MMC/SD/SDIO over SPI
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<*> Samsung S3C SD/MMC Card Interface support
4. 插入SD卡。当开机之后系统启动后插入SD卡就会出现一些信息，还可以看到mmcblk0就是SD设备了。
- s3c2410 TouchScreen successfully loaded
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input: s3c2410 TouchScreen as /class/input/input0
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S3C24XX RTC, (c) 2004,2006 Simtec Electronics
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s3c2410-rtc s3c2410-rtc: rtc disabled, re-enabling
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s3c2410-rtc s3c2410-rtc: rtc core: registered s3c as rtc0
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S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics
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s3c2410-wdt s3c2410-wdt: watchdog inactive, reset disabled, irq enabled
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s3c-sdi s3c2440-sdi: powered down.
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s3c-sdi s3c2440-sdi: mmc0 - using pio, sw SDIO IRQ
5. 重新插入SD卡，开发板已经识别出了SD卡
- [root@yyq2440 /]# mmc0: card b368 removed
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s3c-sdi s3c2440-sdi: powered down.
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mmc0: new SD card at address b368
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mmcblk0: mmc0:b368 SD 1.90 GiB
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mmcblk0: p1
6. 挂载SD卡。执行mount命令将SD卡挂载到/mnt/mmc/目录下，但是没成功，出错了。首先查看/dev/目录下并没有mmcblk0p1节点所以出错，我们查看/proc/partitions/目录发现SD卡的主设备号是179，次设备号是1，那么我们就创建这个设备的节点，b代表块设备，最后再执行mount命令，没有出错。最后可以成功看到SD卡里面的内容。过程如下。
- [root@yyq2440 /]# mkdir mnt/mmc
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[root@yyq2440 /]# mount /dev/mmcblk0p1 /mnt/mmc
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mount: mounting /dev/mmcblk0p1 on /mnt/mmc failed: No such file or directory
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[root@yyq2440 /]# ls /dev
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console null
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[root@yyq2440 /]# cat /proc/partitions
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major minor #blocks name
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31 0 128 mtdblock0
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31 1 384 mtdblock1
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31 2 3072 mtdblock2
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31 3 61440 mtdblock3
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31 4 512 mtdblock4
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31 5 60928 mtdblock5
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179 0 1997312 mmcblk0
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179 1 1997188 mmcblk0p1
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[root@yyq2440 /]# mknod /dev/blk0p1 b 179 1
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[root@yyq2440 /]# rm /dev/blk0p1
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[root@yyq2440 /]# mknod /dev/mmcblk0p1 b 179 1
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[root@yyq2440 /]# mount /dev/mmcblk0p1 /mnt/mmc
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[root@yyq2440 /]# ls /mnt/mmc
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???? htmlhelp.exe st-ndt test.wav
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[root@yyq2440 /]#
2011-03-01
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发表于 2011-12-20 09:44