[U-Boot] 2015.10-rc2 Chromebook Snow boot failure

[Simon Glass]

Hi,

On 21 August 2015 at 09:55, Misha Komarovskiy <zombah at gmail.com> wrote:
> Hello,
> I have failure in attempt to boot Chromebook Snow with 2015.10-rc2
> build snow_defconfig, here is error message, it maybe not full as i
> have some noise on serial console with device:
>
> U-Boot 2015.10-rc2 (Aug 21 2015 - 15:43:43 +0000) for snow
> GPU:   Exynos5250 @ 1.7 GHz
> Model: Google Snow
> Board: Google Snow
> DRAM:  2 GiB
> ERROR: read error from device: bad39118 register: 0x1e!
> at drivers/power/pmic/max77686.c:44/max77686_read()
> initcall sequence bfdaf3bc failed at call 43e0418c (err=-5)
> ### ERROR ### Please RESET the board ###

Register 1e is the BUCK3 voltage - see max77686.h.

I don't get the same addresses as you but I suppose we are using
different toolchains.

But this is probably being called from exynos_power_init().

The ARM voltage is set to 1.0V. I wonder if that is borderline? We
could increase it perhaps to 1.1V. - See the exynos_set_regulator()
line for vdd_arm.

It was previous 1.3V in 2015.07 - see max77686_init().

Are you starting U-Boot SPL directly from the reset vector?

Regards,
Simon