Dear Cliff,
On 10/16/2015 01:46 PM, Cliff Brust wrote:
I have the need to erase our eMMC from U-Boot on our custom board due to a hard wired boot up configuration. Our design is based on the Freescale i.MX6Q SabreSD Board reference design. The bottom line is the U-Boot command "mmc erase" is failing with the error "Timeout waiting for DAT0 to go high!". Here's a list of the U-Boot commands issued and the result of each so you can see what is going on.
=> mmc list FSL_SDHC: 0 FSL_SDHC: 1 (SD) FSL_SDHC: 2 (eMMC)
=> mmc dev 2 switch to partitions #0, OK mmc2(part 0) is current device
=> mmc info Device: FSL_SDHC Manufacturer ID: 45 OEM: 100 Name: SEM08 Tran Speed: 52000000 Rd Block Len: 512 MMC version 4.4.1 High Capacity: Yes Capacity: 7.4 GiB Bus Width: 8-bit Erase Group Size: 512 KiB HC WP Group Size: 16 MiB User Capacity: 7.4 GiB WRREL Boot Capacity: 2 MiB ENH RPMB Capacity: 128 KiB ENH
=> mmc erase 0 0x400 MMC erase: dev # 2, block # 0, count 1024 ... Timeout waiting for DAT0 to go high! mmc erase failed 0 blocks erased: ERROR
Any insight on this issue is greatly appreciated. Thanks, Cliff
This issue is reproducible on Freescale's SABRESD on both SD card and eMMC with v2015.04. The issue has been there always, I believe. Apparently the command erases the first block, but the operation returns an error, so it aborts and it doesn't continue erasing futher blocks.
I opened a similar thread a while ago: http://lists.denx.de/pipermail/u-boot/2015-June/215912.html
Regards, -- Hector Palacios