05-31-2020, 10:36 AM
Still don't know why this was happening - but I flashed the 128GB eMMC module via USB adapter now: Putting the 128GB eMMC module on the USB adapter, I could boot from the SDHC card without problems and use the Debian installer to get a working system on the 128GB eMMC card. No problems after putting the eMMC card back in the PBP, but I still didn't dare to test the SDHC again after booting the new Debian install.
I will try the SDHC card again, when I've got more time - just to see if the I/O errors and clock speed changes show up again.
I will try the SDHC card again, when I've got more time - just to see if the I/O errors and clock speed changes show up again.