AM335X: eMMC interface with MMC2

Hi Jithin,

What is the output when you run this in U-Boot:

# mmc rescan
# mmc list
# mmc part

Best regards,
Miroslav

Dear Team,

   Changes i made for MMC2 for eMMC BOOT

./arch/arm/include/asm/arch/mmc_host_def.h

#elif defined(CONFIG_AM335X)
# define OMAP_HSMMC1_BASE               0x48060100
# define OMAP_HSMMC2_BASE               0x481D8100
# define OMAP_HSMMC3_BASE               0x47810100  /* Added for EMMC Support */

arch/arm/include/asm/omap_common.h

#define BOOT_DEVICE_MMC1        8
#define BOOT_DEVICE_MMC2        9 /* eMMC or daughter card */
#define BOOT_DEVICE_MMC3        10 /* eMMC or daughter card */ /* Added for EMMC Support */

./board/ti/am335x/pll.c

writel(PRCM_MOD_EN, CM_PER_MMC2_CLKCTRL);
       while (readl(CM_PER_MMC2_CLKCTRL) != PRCM_MOD_EN); /* Added for Calixto EMMC Support */

./common/cmd_bootm.c

  if (!strcmp(argv[1], "mmc0")) {
                mmcc = 0;
        } else if (!strcmp(argv[1], "mmc1")) {
                mmcc = 1;
        } else if (!strcmp(argv[1], "mmc2")) {  /* Added for EMMC Support */
                mmcc = 2;
        } else {


char *mmc_sel[3] = {"mmc", "dev", "0",};
                        if (mmcc == 0)
                        mmc_sel[2] = "0";
                else if (mmcc == 1)
                        mmc_sel[2] = "1";
                else if (mmcc == 2)
                        mmc_sel[2] = "2"; /* Added for EMMC Support */


include/configs/am335x_evm.h
#ifdef CONFIG_STORAGE_EMMC

/* Enable below MACRO to use MMC0 as the boot device, for eMMC raw boot */
/* #define CONFIG_USE_MMC0 */
/* Enable below MACRO to use MMC1 as the boot device, for eMMC raw boot */
/*#define CONFIG_USE_MMC1*/

#define CONFIG_USE_MMC2

#ifdef CONFIG_USE_MMC0
#undef CONFIG_USE_MMC1
#undef CONFIG_USE_MMC2
#endif

#ifdef CONFIG_USE_MMC2
#undef CONFIG_USE_MMC0
#undef CONFIG_USE_MMC1
#endif

#endif

#ifdef CONFIG_STORAGE_EMMC
#ifdef CONFIG_USE_MMC0
#define CONFIG_BOOTCOMMAND "booti mmc0"
#endif
#ifdef CONFIG_USE_MMC1
#define CONFIG_BOOTCOMMAND "booti mmc1"
#endif
#ifdef CONFIG_USE_MMC2
#define CONFIG_BOOTCOMMAND "booti mmc2"
#endif
#else

********************************************************************

OUTPUT AFTER BOOTs:

U-Boot 2011.09 (Nov 30 2012 - 16:23:17)

I2C:   ready
DRAM:  512 MiB
WARNING: Caches not enabled
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
NAND:  HW ECC Hamming Code selected
No NAND device found!!!
0 MiB
MMC:   Inside OMAP_HSMMC3_BASE
OMAP SD/MMC: 0, OMAP SD/MMC: 2
Card did not respond to voltage select!
mmc2(part 0) is current device
Card did not respond to voltage select!
FAIL:Init of MMC cardLoaded eMMC partition table*** Warning - readenv() failed, using default environment

Net:   cpsw
Hit any key to stop autoboot:  0
Card did not respond to voltage select!
mmc2(part 0) is current device
booti: cannot find 'boot' partition

Regards

Jithin

Clocks, pinmux for mmc2 needs to be handled in board file.

Dear Team,

Here is my current setting for PIN MUX

/u-boot-r/board/ti/am335x/mux.c

static struct module_pin_mux emmc_mmc2_pin_mux[] = {
        {OFFSET(mii1_col), (MODE(5) | RXACTIVE | PULLUP_EN)},   /* MMC2_DAT3 */
        {OFFSET(mii1_txd2), (MODE(5) | RXACTIVE | PULLUP_EN)},  /* MMC2_DAT2 */
        {OFFSET(mii1_txd3), (MODE(5) | RXACTIVE | PULLUP_EN)},  /* MMC2_DAT1 */
        {OFFSET(mii1_rxdv), (MODE(5) | RXACTIVE | PULLUP_EN)},  /* MMC2_DAT0 */
        {OFFSET(gpmc_clk), (MODE(3) | RXACTIVE | PULLUP_EN)},   /* MMC2_CLK */
        {OFFSET(gpmc_csn3), (MODE(3) | RXACTIVE | PULLUP_EN)},  /* MMC2_CMD */
        {OFFSET(gpmc_wpn), (MODE(7) | RXACTIVE | PULLUP_EN)},   /* MMC2_CD */
        {-1},
};

void enable_emmc_mmc2_pin_mux(void)
{
        configure_module_pin_mux(emmc_mmc2_pin_mux);
}

/u-boot-r/board/ti/am335x/mux.c

int board_init(void)
{

    enable_emmc_mmc2_pin_mux();

   ......

   ......

}

The above mentioned  are done for pin mux setting,

As per your suggestion i want  to add the below clock settings in evm.c

writel(PRCM_MOD_EN, CM_PER_MMC2_CLKCTRL);
        while (readl(CM_PER_MMC2_CLKCTRL) != PRCM_MOD_EN);

Please comment whether my statement is correct.

Regards

Jithin

Depending on the version of u-boot, look in either board/ti/am335x/board.c or arch/arm/cpu/armv7/am33xx/board.c for omap_mmc_init. In the code I have, only mmc0 and mmc1 are initialized. You probably have to add mmc2. The code I have is below.

int cpu_mmc_init(bd_t *bis)
{
        int ret;

        ret = omap_mmc_init(0, 0, 0);
        if (ret)
                return ret;

        return omap_mmc_init(1, 0, 0);
}

Steve K.

Jithin,

Can you please tell me what the solution was?  I am also running into the same error: "Card did not respond to voltage select!"

Thanks,

Chuck

hi,

      Just enable MMC_HS support in omap_hmmc.c in uboot

Regards

Jithin

Hi Jithin :

Sorry to bother you!

We have a custom board that uses mmc2 for eMMc and I do not know if AM335x can boot from mmc2.

According your design, do you boot from mmc2?

If the answer is yes, how do you connect your sysboot pin?

Please give me your suggestion.

Thank you!

Best regard,

Marcus

Dear Marcus,

         AM335x doesn't have MMC2 boot, Supported interfaces are MMC0 and MMC1. if you have SPI Flash in you board you can boot first from SPI and then from EMMC, if you add support for EMMC and SPI Flash in uboot, below following way you can boot.

SPI FLASH -> MLO and u-boot.img

EMMC -> uImage and Filesystem

if you are planning to change the MMC2 to MMC1 Please refer TRM for boot pins to connect  MMC1, because only dedicated pins are support for MMC1 boot.

Otherwise you can have a SPI Flash in your Board.

Regards

Jithin

Hi Jithin :

I appreciate your reply.

I think I need to find out another way to replace mmc2 boot device.

Best regards,

Marcus

Hi Jithin,

Exactly the same issue we are also facing.(We are using SDK7.0)

In our design we have NOR flash and eMMC connected to MMC2  port. We are able to see the eMMC in kernel when we boot from NOR flash. But facing problem to program the filesystem into eMMC.

We need your suggestions to make it working.

I need to access the eMMC in uboot to flash the filesystem.

I did the changes which all you suggested.

Here below are the changes.

--- a/arch/arm/cpu/armv7/am33xx/board.c
+++ b/arch/arm/cpu/armv7/am33xx/board.c
@@ -49,11 +49,15 @@ int cpu_mmc_init(bd_t *bis)
 {
        int ret;
 
+#ifdef eMMC2_ENABLE
+       return omap_mmc_init(2, 0, 0, -1, -1);
+#else
        ret = omap_mmc_init(0, 0, 0, -1, -1);
        if (ret)
                return ret;
-
+       
        return omap_mmc_init(1, 0, 0, -1, -1);
+#endif
 }
 #endif

--- a/arch/arm/cpu/armv7/am33xx/clock_ti814x.c
+++ b/arch/arm/cpu/armv7/am33xx/clock_ti814x.c
@@ -173,6 +173,11 @@ static void enable_per_clocks(void)
        writel(PRCM_MOD_EN, &cmalwon->mmchs1clkctrl);
        while (readl(&cmalwon->mmchs1clkctrl) != PRCM_MOD_EN)
                ;
+       
+       /* HSMMC2 */
+       writel(PRCM_MOD_EN, &cmalwon->mmchs2clkctrl);
+       while (readl(&cmalwon->mmchs2clkctrl) != PRCM_MOD_EN)/*added MMC2 eMMC support*/
+               ;
 
        /* Ethernet */
        writel(PRCM_MOD_EN, &cmalwon->ethclkstctrl);

--- a/arch/arm/include/asm/arch-am33xx/mmc_host_def.h
+++ b/arch/arm/include/asm/arch-am33xx/mmc_host_def.h
@@ -23,6 +23,7 @@
  */
 #define OMAP_HSMMC1_BASE               0x48060100
 #define OMAP_HSMMC2_BASE               0x481D8100
+#define OMAP_HSMMC3_BASE               0x47810100 /*Added for eMMC support on MMC2 port*/
 
 #if defined(CONFIG_TI814X)
 #undef MMC_CLOCK_REFERENCE

--- a/arch/arm/include/asm/arch-am33xx/spl.h
+++ b/arch/arm/include/asm/arch-am33xx/spl.h
@@ -28,6 +28,7 @@
 #if defined(CONFIG_AM33XX)
 #define BOOT_DEVICE_MMC1       8
 #define BOOT_DEVICE_MMC2       9       /* eMMC or daughter card */
+#define BOOT_DEVICE_MMC3       10
 #elif defined(CONFIG_TI814X)
 #define BOOT_DEVICE_MMC1       9
 #define BOOT_DEVICE_MMC2       8       /* ROM only supports 2nd instance */

--- a/drivers/mmc/omap_hsmmc.c
+++ b/drivers/mmc/omap_hsmmc.c
@@ -637,10 +637,15 @@ int omap_mmc_init(int dev_index, uint host_caps_mask, uint f_max, int cd_gpio,
 #ifdef OMAP_HSMMC3_BASE
        case 2:
                priv_data->base_addr = (struct hsmmc *)OMAP_HSMMC3_BASE;
+#ifdef eMMC2_ENABLE
+               host_caps_val |= MMC_MODE_8BIT;
+               printf("\nOMAP_HSMMC3_BASE case\n");
+#else          
 #if defined(CONFIG_DRA7XX) && defined(CONFIG_HSMMC3_8BIT)
                /* Enable 8-bit interface for eMMC on DRA7XX */
                host_caps_val |= MMC_MODE_8BIT;
 #endif
+#endif
                break;
 #endif
        default:

Here below are the pinmux details,

static struct module_pin_mux mmc2_pin_mux[] = {
    {OFFSET(gpmc_a9), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT7 */
    {OFFSET(gpmc_a8), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT6 */
    {OFFSET(gpmc_a7), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT5 */
    {OFFSET(gpmc_a6), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT4 */
    {OFFSET(gpmc_be1n), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT3 */
    {OFFSET(gpmc_a3), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT2 */
    {OFFSET(gpmc_a2), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT1 */
    {OFFSET(gpmc_a1), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT0 */
    {OFFSET(gpmc_clk), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_CLK */
    {OFFSET(gpmc_csn3), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_CMD */
    {-1},
};

Rgds,

chandra

After all this change I am getting the log in uboot as follows and device resets,

U-Boot 2013.10-00193-g7f472be-dirty (Jul 10 2014 - 16:58:58)

I2C:   ready
DRAM:  256 MiB
board_init.
Flash: 32 MiB
MMC:   
OMAP_HSMMC3_BASE case
OMAP SD/MMC: 0
Using default environment

Net:   usb_ether
Hit any key to stop autoboot:  0
data abort

    MAYBE you should read doc/README.arm-unaligned-accesses

pc : [<8f776bb8>]          lr : [<8f77667c>]
sp : 8f337960  ip : 8f33ed7a     fp : 8f33ed48
r10: 8f7a501c  r9 : 8f337f38     r8 : 00000003
r7 : 8f33ed88  r6 : 8ffbbb10     r5 : 00000000  r4 : 47810100
r3 : 8ffbb820  r2 : 00001563     r1 : 00001562  r0 : 8ffbbb10
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32
Resetting CPU ...

resetting ...

Rgds,

chandra

Chandra,

Enable the clock in /arch/arm/cpu/armv7/am33xx clock_am33xx.c

Steve K.