Hi,
On 17-05-15 18:08, Lawrence Y wrote:
Hi,
I'm not sure if it is my sdcard, my A31 hummingboard device, or something I
am doing wrong, but I've been trying to boot an A31 hummingbird from an
sdcard using the kernel from the sunxi-next branch at
https://github.com/mripard/linux
33da8d2 - Merge tag 'ib-mfd-regulator-v4.2' into sunxi-next
and ran into a problem where the kernel would hang while waiting for the
root device /dev/mmcblk0p2
If I use the sun6i-a31-hummingbird.dtb built from the linux mainline the
sdcard will boot the root file system correctly, but if I use
the sun6i-a31-hummingbird.dtb from sunxi-next the kernel will hang while
waiting for /dev/mmcblk0p2.
I ran a git bisect and narrowed down the commit that causes the problem I
am seeing to
commit bab03561224baa536b98f1d137d2b6b5dd159763
Date: Tue Mar 10 19:59:21 2015 +0800
ARM: dts: sun6i: hummingbird: Add AXP221 regulator nodes
This patch adds the AXP221 regulators. Only the ones directly used
on the board are added.
Please let me know if there is anything I can do to help fix this problem,
if it really is a problem. I have an A31 hummingbird available for testing.
Interesting, what is the voltage set in the dts for dcdc1 ? We've seen issues
in the past where the sdcard would not work reliable with that set to 3.0
(which is the default on most boards), but where it will work fine when set
to 3.3V.
Regards,
Hans
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