PBP won’t boot from eMMC after Debian update / Tow-Boot installer won’t boot from SD
04-28-2022, 12:53 PM
(04-28-2022, 11:04 AM)wdt Wrote: Since in OP you said there was a green led (I assume no SD inserted) there must be something on emmc
When no uboot (really idbloader) can be found, there are no leds, you think it is dead
So, you must have done something wrong
Point ghex at /dev/emmc (mmcblk....) and go sector 64
idbloader ALWAYS (all versions) has file signature 3b 8c dc fc
This is how the boot rom 'knows' that is 'right' code (and to stop looking)
or dd if=/dev/emmc of=idb.test bs=512 skip=64 count=512 (idbloader varies,, 160K-210K)
Yes, there is a green LED when booting without an SD or with the Tow-Boot installer SD.
Yesterday I dd’d the emmc (mmcblk2) while chrooted into the emmc. I tried again just now while booted into Debian 11 from SD with the emmc mounted. The result was the same: Only 00’s in the display pane and dots in the ASCII column.
Then I tried your last (imdb.test) suggestion. This produced something more interesting. I’m afraid I have no idea how to point GHex to sector 64 so I tried a search for 3b 8c dc fc but that did not produce anything. There is human readable information in the ASCII column but nothing that means much to me..
