Emmc problem

Lodebakker

Update: I don't get the first error anymore, but now I get this problem:  I'm able to do the lc_distro_transfer, but I get an error during grub install: "failed to register the EFI boot entry: no such file or directory"

Hello,
I think I did something wrong. And when trying to do the sudo lc_distro_transfer I get the error /dev/mmcblk0 is not a block device
Any suggestions on how to fix this.

Lodebakker

When I type lsblk I see mmcblk0 with 3 partitions: mmcblk0p1, mmcblk0p2, mmcblk0 and I see mmcblk0boot0, boot1
Is there a way to completely clear the emmc module and restart?

Marvin

Just clear the partition table by writing 1MB of zeroes to the beginning of the device:
sudo dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=1
Or if you want to clear the whole module by writing it full of 0's:
sudo dd if=/dev/zero of=/dev/mmcblk0 bs=1M

Just a sidenote, the BEST way to clear a mmc module would be to trim it but the Amlogic mmc driver does not have trimming enabled. This would not write 0s to the module but tell the module to erase ITSELF from INSIDE itself:
sudo blkdiscard /dev/mmcblk0
But it's not supported and looks like no-one is pursuing enabling this for the upstream kernel.

Lodebakker

Marvin said:

Just clear the partition table by writing 1MB of zeroes to the beginning of the device:
sudo dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=1
Or if you want to clear the whole module by writing it full of 0's:
sudo dd if=/dev/zero of=/dev/mmcblk0 bs=1M

I get an error: error writing 'dev/mmcblk0: no space left at device

Lodebakker

So now I'm able to do the lc_distro_transfer, but I get an error during grub install: "failed to register the EFI boot entry: no such file or directory"

Marvin

For the bottom one it will end with "error" when the emmc has been fully written over. The command will try to write 1MB of zeroes then next then next then next and when it has reached the end there is no space left to write any futher zeroes. That is normal. If you want it to not "error" you should give it exact number of count=XXX to cover the whole space.

loverpi

@Lodebakker We uploaded new images for Buster. The previous lc_distro_transfer script didn't account for changes to grub-install in Debian Buster and was attempting to set thing in non-existent nvram. The new images fixes that.

Ingmar

Houston, we have lift-off. 

jimm0thy

Thanks for all the quick updates and image fixes

loverpi

Yeah we are here to help. Let us know what issues you run into. LibreELEC, RetroPie, and Android 9 are coming too.