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<
etrig>
still hunting for relevant information, but does somebody know if there are any outstanding issues with SD cards on odroid-c2?
<
etrig>
running linux 5.5.11 and my board almost never reboots successfully, having tried three different cards
<
etrig>
thinking it might be related to tflash_vdd and tf_io regulators, but not having any success with my device tree modifications yet
<
repk>
etrig: Does it boot fine with the same card when you plug unplug power ?
<
etrig>
repk: it does
<
etrig>
repk: only on reboot specifically do I get things like "fs_devread read error - block" in u-boot
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repk>
etrig: hm weird
<
etrig>
I was running u-boot 2019.04 and just upgraded to 2020.01 to be sure
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<
xdarklight>
the tflash_vdd regulator also exists on Odroid-C2 but it doesn't have the regulator-always-on; property there
<
xdarklight>
please try setting it and report back
<
etrig>
xdarklight: that's what inspired me to try with tflash_vdd and then also tf_io, but it didn't seem to make a difference
<
etrig>
unfortunately all three of my cards are sandisk brand and maybe all share the same problem
<
xdarklight>
etrig: hmm, can you drop all the sd-uhs-* modes from sd_emmc_b and try again?
<
xdarklight>
maybe Linux leaves tf_io at 1.8V and then the bootrom gets confused
<
etrig>
xdarklight: I'll try that, thanks
<
xdarklight>
(without the sd-uhs-* mode the card IO will stay at 3.3V)
<
etrig>
does "regulator-boot-on" have any value here?
<
xdarklight>
AFAIK no
<
etrig>
and should I also be rebuilding u-boot with these device tree changes?
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<
xdarklight>
I'm not sure about what u-boot does and what not. if doesn't take much effort then it's worth trying
<
xdarklight>
it's interesting that the bootrom can actually read u-boot from SD card but then it fails in u-boot
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etrig>
wonder if it's a clock issue rather than a voltage issue
<
etrig>
since a reboot occasionally works
<
etrig>
xdarklight: two successful reboots by dropping sd-uhs-*
<
xdarklight>
can you check the GPIOs used by the two regulators in u-boot?
<
xdarklight>
if those look good then you are probably right with your suspicion that it's a clock issue (or a card/controller interoperability issue)
<
etrig>
I tried enabling just sd-uhs-sdr12 and immediately hit the issue again