s5pv210?uboot-2012-10移植(七)?之支持SD卡?

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我其實對SD卡的操作不是很熟悉，所以移植的肯定有問題，在隨機贈送的Kingston?4G的SD卡上可以進行讀寫，但是我換了張2G的SD卡，就不行了，原因暫時先不找了，等熟悉了SD卡的操作再看看，哪位大俠知道怎么移植的一定要告訴我，不勝感激。

1.include/configs/smdkv210.h?+94

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#define CONFIG_GENERIC_MMC #define CONFIG_MMC #define CONFIG_SDHCI #define CONFIG_S5P_SDHCI #define CONFIG_CMD_MMC

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2.在board/samsung/smdkv210/smdkc100.c添加

int board_mmc_init (bd_t *bis) { //printf ("haha\n"); #define GPG0CON (*(volatile unsigned int *)0xE02001A0) #define GPG0DRV (*(volatile unsigned int *)0xE02001AC) #define GPG3CON (*(volatile unsigned int *)0xE0200200) #define CLK_DIV4 (*(volatile unsigned int *)0xE0100310) #define CLK_SRC4 (*(volatile unsigned int *)0xE0100210) #define MOUTMMC (50000000) /* 50MHz */ unsigned long clk_src, clk_div, mpll, div; //初始化MMC0 MM3管腳，4bit模式 GPG0CON = (0x2<<0)|(0x2<<4)|(0x2<<8)|(0x2<<12)|(0x2<<16)|(0x2<<20)|(0x2<<24); GPG3CON = (0x2<<0)|(0x2<<4)|(0x2<<8)|(0x2<<12)|(0x2<<16)|(0x2<<20)|(0x2<<24); //GPG0DRV = 0x3fdf; //初始化SD時鐘 clk_ CLK_SRC4; clk_src &= ~((0xf << 12) | 0xf); clk_src |= (0x6 << 12) | 0x6; mpll = get_pll_clk(MPLL); div = ((mpll + MOUTMMC) / MOUTMMC) - 1; clk_div = CLK_DIV4; clk_div &= ~((0xf << 12) | 0xf); clk_div |= (div << 12) | div; CLK_SRC4 = clk_src; CLK_DIV4 = clk_div; return s5p_sdhci_init(0xEB000000, 0, 4)|s5p_sdhci_init(0xEB300000, 1, 4); }

3.修改drivers/mmc/sdhci.c?+133

/* Wait max 10 ms */ timeout = 10; #if 0 sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS); mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT; /* We shouldn't wait for data inihibit for stop commands, even though they might use busy signaling */ if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION) mask &= ~SDHCI_DATA_INHIBIT; #endif /* * PRNSTS * CMDINHDAT[1] : Command Inhibit (DAT) * CMDINHCMD[0] : Command Inhibit (CMD) */ mask = (1 << 0); if ((data != NULL) || (cmd->resp_type & MMC_RSP_BUSY)) mask |= (1 << 1); /* * We shouldn't wait for data inihibit for stop commands, even * though they might use busy signaling */ if (data) mask &= ~(1 << 1); //mask = 1; //printf ("mask: %08x\n read: %08x\n", mask, sdhci_readl(host, SDHCI_PRESENT_STATE)); while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) { if (timeout == 0) { printf("Controller never released inhibit bit(s).\n"); return COMM_ERR; } timeout--; udelay(1000); }

4.修改drivers/mmc/mmc.c把sd_change_freq中的最后兩個returne?err;?給屏蔽掉

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//if (err) //return err;

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5.make，使用命令燒入SD卡里，啟動開發板

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轉載于:https://blog.51cto.com/7090376/1265343

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