fl2440内核linux-3.0移植-----添加SD卡支持

来源：互联网发布：阿里云注册编辑：程序博客网时间：2024/05/17 03:55

Linux—3.0中对S3C2440 SD驱动已经支持的非常好。为了让FL2440支持SD卡，只需要完成几个步骤即可。

1. 在内核中注册SD卡平台设备。通过修改mach-smdk2440.c 文件来实现。在mach-smdk2440.c文件的smdk2440_devices数组中增加s3c_device_sdi 平台设备成员，如下所示：（红色为添加部分）

[lingyun@localhost linux-3.0]$ vim arch/arm/mach-s3c2440/mach-smdk2440.c

static struct platform_device *smdk2440_devices[] __initdata = {
&s3c_device_ohci,
&s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c0,
&s3c_device_iis,
&s3c_device_rtc,
&s3c_device_dm9000, /* modify by liuchengdeng */
&s3c_device_adc, /* modify by liuchengdeng */
&s3c_device_ts, /* modify by liuchengdeng */
&uda1340_codec, /* modify by liuchengdeng */
&s3c24xx_uda134x, /* modify by liuchengdeng */
&samsung_asoc_dma, /* modify by liuchengdeng */
&s3c_device_sdi, /* modify by liuchengdeng */
};

2. 修改s3cmci.c，设置检测SD卡插入的中断号，及配置响应的引脚为中断功能。如下所示：修改s3cmci_probe函数：

vim drivers/mmc/host/s3cmci.c

将host->irq_cd = gpio_to_irq(host->pdata->gpio_detect);修改为
host->irq_cd = IRQ_EINT16;/* add by liu chengdeng*/

s3c2410_gpio_cfgpin(S3C2410_GPG(8), S3C2410_GPG8_EINT16);/* add by liu chengdeng */

3. 3、添加MMC内核配置选项

在内核的MMC配置选项中添加对S3C SD/MMC的支持，如下所示：

Device Drivers --->

<*> MMC/SD/SDIO card support --->

--------------------------------------------------------------------------------------------+ |
| | --- MMC/SD/SDIO card support | |
| | [ ] MMC debugging | |
| | [ ] Assume MMC/SD cards are non-removable (DANGEROUS) | |
| | [ ] MMC host clock gating (EXPERIMENTAL) | |
| | *** MMC/SD/SDIO Card Drivers *** | |
| | <*> MMC block device driver | |
| | (8) Number of minors per block device | |
| | [*] Use bounce buffer for simple hosts | |
| | < > SDIO UART/GPS class support | |
| | < > MMC host test driver | |
| | *** MMC/SD/SDIO Host Controller Drivers *** | |
| | < > Secure Digital Host Controller Interface support | |
| | < > MMC/SD/SDIO over SPI | |
| | <*> Samsung S3C SD/MMC Card Interface support | |
| | [ ] Hardware support for SDIO IRQ | |
| | Samsung S3C SD/MMC transfer code (Use PIO transfers only) --->

444、编译内核即可：make

5、烧录内核打印如下信息时说明已经支持SD卡了：

dm9000 dm9000: eth0: link down
s3c-sdi s3c2440-sdi: powered down.
s3c-sdi s3c2440-sdi: running at 0kHz (requested: 0kHz).
s3c-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).
s3c-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).
s3c-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).
usb 1-1: new full speed USB device number 2 using s3c2410-ohci
s3c-sdi s3c2440-sdi: powered down.

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