We have replaced the SD card slot on the dragonboard with a more resilient eMMC, Kingston EMMC04G-W627-X03U. We have sucessfully mounted the eMMC and are trying to boot from it. We have copied the internal eMMC to our external. Loading dragonboard-410c-bootloader-sd-linux-154/emmc_appsboot.mbn into the aboot partition of the internal, mmcblk0p7.
First we got this error:
[90] [90] SDHC Running in HS200 mode
[100] [100] Switch cmd failed. Switch Error.
[100] [100] Switch cmd returned failure 870
[100] [100] Failure to set HS200 mode for Card(RCA:2)
[110] [110] Failed detecting MMC/SDC @ slot2
[110] [110] mmc init failed![120] [120] panic (caller 0x8f600d70): ASSERT FAILED at (target/msm8916/init.c:132): 0
We tried changing the mode and got a different error.
[10] [10] platform_init()
[10] [10] target_init()
[20] [20] test custom LK
[20] [20] initialising mmc_slot =2
[60] [60] SDHC Running in DDR mode
[70] [70] Done initialization of the card
[70] [70] Error: DATA CRC error
[70] [70] MBR signature does not match.
[70] [70] MMC Boot: MBR read failed!
[80] [80] Error reading the partition table info
[80] [80] panic (caller 0x8f61cfe4): ASSERT FAILED at (target/msm8916/init.c:202): 0
[90] [90] HALT: reboot into dload m�
