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

[Misha Komarovskiy]

Hello Simon,
2015.07 and 2015.10-rc1 both boot fine. I use this U-Boot as third
stage from SD card/USB stick, im not quite
sure what right name for this position from reset vector.
I will try to increase  ret = exynos_set_regulator("vdd_arm",
1000000); to 1100000 and report result.
---
Best Regards,
Misha Komarovskiy
zombahatgmaildotcom


On Mon, Aug 24, 2015 at 12:21 AM, Simon Glass <sjg at chromium.org> wrote:
> 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