16 Jan
2014
16 Jan
'14
5:01 p.m.
On Thu, Jan 16, 2014 at 1:50 PM, Otavio Salvador otavio@ossystems.com.br wrote:
It worked for you probably because you used the ldo bypass mode.
Yes; I did the bypass mode.
We currently don't do LDO bypass mode in mainline U-boot. We do it in FSL U-boot.
With LDO bypass, lower VDDARM and VDDSOC voltages can be supplied as per the mx6 datasheet.
I just measured with the scope and the VDDARM/SOC voltages supplied by the 3.10 FSL kernel are below the minimum for the LDO enabled case. So setting LDO bypass in U-boot 'fixes' the issue.
We can implement LDO bypass after 2014.01 is out, but for this release let's just revert the VDDPU disable patch.
Do you agree?
Regards,
Fabio Estevam