Re: [PATCH 4/4] ARM: tegra: correct Colibri T20 regulator settings

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Hi,

I ran the mainline Kernel the first time on my Colibri T20. I compiled
3.11-rc2 without any patch, but the kernel refused to boot, the boot
process freezed just while probing SM2:
[    0.420075] vdd_sm2,vdd_ddr: 3700 mV

I then applied this patch, but without luck, the freeze happend even
earlier:
[    0.413314] vdd_sm1,vdd_cpu: supplied by vdd_5v0

However, using 3.8 works for me:
[    0.419848] vdd_sm2,vdd_ddr: 3800 mV
[    0.423851] vdd_sm2,vdd_ddr: supplied by vdd_5v0

My Module Version is 1.2a with TPS658643 PMIC on it.


Am 2013-07-21 23:28, schrieb Lucas Stach:
> Core and CPU voltage settings were a bit on the safe side. The actually
> used chips on the Colibri allow for lower voltages and work just fine
> this way.
This voltages seem to work for me too...

 
> SM2 is not a the parent of LDO regs, but actually the DDR regulator. The
> Colibri uses a different version of the TPS with other voltage mapping
> tables for SM2, currently we cheat by setting a fake 3,2V which results
> in 1,8V physical.
I could successfully boot with 1.8V, but with messages complaining that
probe failed... 

--
Stefan
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