AM437x: eMMC support in U-boot

Hi,

I don't think we can give any advice without more information from you. Please give a detailed description of the hardware and software configuration and what issues you see.

Hi Biser,

standard deliverables are being used
* AM437x GP EVM Rev1.4a with EMMC
* Latest PSDK 2.00.02.11 and the u-boot from there as the baseline

Again the customer enables the pinmux for the EMMC, changes u-boot config, handles the NAND or EMMC GPIO. See below.

The EMMC works now, but only on a cold boot. If doing a soft reboot, something is still missing. We suspect the EMMC RST line, and trying to test that. The question is whether we have tested EMMC with soft reboot on our end and found what fixes it.


static struct module_pin_mux mmc2_pin_mux[] = {
{OFFSET(gpmc_ad0), (MODE(1) | PULLUP_EN | RXACTIVE)}, /* AD0 */
{OFFSET(gpmc_ad1), (MODE(1) | PULLUP_EN | RXACTIVE)}, /* AD1 */
{OFFSET(gpmc_ad2), (MODE(1) | PULLUP_EN | RXACTIVE)}, /* AD2 */
{OFFSET(gpmc_ad3), (MODE(1) | PULLUP_EN | RXACTIVE)}, /* AD3 */
{OFFSET(gpmc_ad4), (MODE(1) | PULLUP_EN | RXACTIVE)}, /* AD4 */
{OFFSET(gpmc_ad5), (MODE(1) | PULLUP_EN | RXACTIVE)}, /* AD5 */
{OFFSET(gpmc_ad6), (MODE(1) | PULLUP_EN | RXACTIVE)}, /* AD6 */
{OFFSET(gpmc_ad7), (MODE(1) | PULLUP_EN | RXACTIVE)}, /* AD7 */

{OFFSET(gpmc_csn1), (MODE(2) | PULLUP_EN | RXACTIVE)},
{OFFSET(gpmc_csn2), (MODE(2) | PULLUP_EN | RXACTIVE)},

{OFFSET(gpmc_wpn), (MODE(7) | PULLUP_EN)}, /* eMMC Reset */
{OFFSET(spi2_cs0), (MODE(9) | PULLUP_EN)}, /* GPIO0_23 SEL_eMMCorNANDn */

{-1},
};
2. Added this to enable_board_pin_nmux()
#if defined(CONFIG_NAND)
configure_module_pin_mux(nand_pin_mux);
#else
configure_module_pin_mux(mmc2_pin_mux);
#endif
3. I did remove NAND from defconfig:
CONFIG_ARM=y
CONFIG_AM43XX=y
CONFIG_TARGET_AM43XX_EVM=y
CONFIG_SPL=y
CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1"
# CONFIG_CMD_IMLS is not set
# CONFIG_CMD_FLASH is not set
# CONFIG_CMD_SETEXPR is not set
CONFIG_SPI_FLASH_BAR=y
CONFIG_SPI_FLASH=y


Regards,
--Gunter