Raspbian for Robots boot stalls at "mmc1: new high speed SDIO card at address 0001"

Greetings!

I am trying to create a different kind of multi-boot environment and I am stuck.

First: I know this works because I tried it before with a different version of Raspbian, (the plain vanilla 32 and 64 bit versions of Raspbian).

Now I have extended this to contain

  • Raspbian for Robots buster
  • GoPiGo O/S 3.0
  • Full up latest version of Raspberry Pi O/S 32 bit
  • Full up latest version of Raspberry Pi O/S 64 bit.

Previously, except for some PARTUUID errors, (silly me!), everything was golden.

Today while trying to boot R4R for the first time I am getting as far as

mmc1: new high speed SDIO card at address 0001
random: crng init done

Without typing in the entire screen, the last few messages are:

mc1: queuing unknown CIS tuple 0x80 (3 bytes)
mmc0 SDHCI controller on fe340000.emmc2 [fe340000.emmc2] using ADMA
of_cfs_init
of_cfs_init: OK
Waiting for root device PARTUUID=0df6e72d-05
random: fast init done
mmc1: new high speed SDIO card at address 0001
random: crng init done

It has been sitting for about five minutes.

I don’t know if it’s still waiting for the root device or something else is the problem.

Any help would be gratefully appreciated.

Update:
It appears that the latest, as-released, version of Raspbian for Robots (2019-12-12 or thereabouts) does not have boot files compatible with booting directly to a USB device.  What puzzled me is that I’ve been booting R4R to a USB device for a while now - so why should R4R “suddenly” stop working?

I do not know this for a fact, but I strongly suspect that subsequent upgrades to the system since the original installation to its SD card updated the boot files and configuration to make it compatible.

Copying all the “fixup[xx]” and start[xxx].elf files from GoPiGo O/S’s boot partition to the boot partition of Raspbian for Robots, appears to “fix” the problem.

Note that I have not yet tried this with anything other than a Pi-4 4gb system.

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After some thought, I have decided that the above description requires some correction and amplification as I forgot to include parts of the issue.

First:
The original, as shipped, Raspbian for Robots will not boot at all, failing with a boot message that the start4.elf and it’s associated fixups file are “too old” and are (apparently) not compatible with a direct-to-USB boot.  (Earlier versions of Raspbian required a two-step boot process starting with a boot from SD card that then transferred control to the USB device.)

Second:
To fix this, I copied over the start[xx].elf files and the associated fixup files from the most recent version of Raspbian (32 bit) and tried to boot again.  This time it failed with the issue noted above.

Third:
I then tried by copying over an older, (but more recent), version of these files from the GoPiGo O/S 3.0.  This appears to work, but creates it’s own subtle set of issues.  Apparently what is needed is an updated set of boot files in the initial boot partition, followed by the original boot files in the target boot partition that you boot into.

More as I learn more.

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