BananaPi M2 support

[Chen-Yu Tsai]

On Wed, Nov 18, 2020 at 7:14 PM Sergey Suloev <ssuloev at orpaltech.com> wrote:
>
> Hi, ChenYu,
>
> thanks for for the help. I tried to use
> "root=PARTUUID=a09ef512-7f29-47b8-8e9a-db5d1d58d8be" in kernel boot
> parameters,
> the new log is here  https://pastebin.com/EL3uaRpE.
>
> Nothing has actually changed, the only difference  is that it now says:
>
> [    1.750270] Waiting for root device
> PARTUUID=a09ef512-7f29-47b8-8e9a-db5d1d58d8be...
>
>
> I verified that a09ef512-7f29-47b8-8e9a-db5d1d58d8be is the actual
> partition id from my sdcard.

That is the partition's UUID alright, but not what PARTUUID expects.
PARTUUID is the partition table's ID + "-" + an index to the partition.
If you're using an MBR partition table, and the partition is the first one,
then it would be an 8 digit hexadecimal ID with "-01" appended.

Just put the SD card in another machine and look under /dev/disks/by-partuuid/
to see what the value should be.

ChenYu

> Thank you,
> Sergey
>
>
> On 17.11.2020 20:36, Chen-Yu Tsai wrote:
> > Hi,
> >
> > On Wed, Nov 18, 2020 at 1:06 AM Sergey Suloev <ssuloev at orpaltech.com> wrote:
> >> Hi, ChenYu,
> >>
> >> I have tried to build and run linux-next  by tag  "next-20201117".
> >> Now the boot log looks different but the kernel still hangs. See
> >> https://pastebin.com/gFk7XuBc
> > Due to the new asynchronous probing of mmc controllers, the mmcblock
> > device numbers likely have changed, as seen here:
> >
> > [ 1.652275] mmc1: new high speed SDHC card at address 0001
> > [ 1.652568] hub 1-1:1.0: USB hub found
> > [ 1.658587] mmcblk1: mmc1:0001 EB1QT 29.8 GiB
> > [ 1.661777] hub 1-1:1.0: 4 ports detected
> > [ 1.670263] mmcblk1: p1
> >
> > You should change your root device specification to use PARTUUID,
> > instead of hardcoding the index.
> >
> >
> > Regards
> > ChenYu
> >
> >> Thank you,
> >> Sergey
> >>
> >>
> >> On 17.11.2020 11:06, Chen-Yu Tsai wrote:
> >>> Hi,
> >>>
> >>> Please try linux-next. There were some regulator fixes that got merged recently.
> >>> One of them fixes an infinite recursion when resolving regulator supplies.
> >>>
> >>> ChenYu
> >>>
> >>> On Tue, Nov 17, 2020 at 1:12 AM Sergey Suloev <ssuloev at orpaltech.com> wrote:
> >>>> Hi, Maxime,
> >>>>
> >>>> it just hangs on that last lines and nothing happens anymore, see 5.18 log.
> >>>>
> >>>>
> >>>> On 16.11.2020 18:52, Maxime Ripard wrote:
> >>>>> Hi,
> >>>>>
> >>>>> On Sat, Nov 14, 2020 at 08:20:54PM +0300, Sergey Suloev wrote:
> >>>>>> Hi,
> >>>>>>
> >>>>>> I noticed that BananaPi M2 (A31 SoC) does not boot anymore on modern
> >>>>>> kernels. The problem arises somewhere between 5.7.19 - 5.8.18. I have saved
> >>>>>> boot logs for both versions https://pastebin.com/DTRZi8R7  and
> >>>>>> https://pastebin.com/PS2hq07A. Logs have been taken on clean/non-patched
> >>>>>> kernel with default config, u-boot v2020.10.
> >>>>>>
> >>>>>> The kernel versions 5.7.x and below work well (I tried 5.5.19 and 5.6.19).
> >>>>>> The versions 5.8.18 and above all fail (5.9 and 5.10).
> >>>>>>
> >>>>>> Could you look at the problem or provide an advice about further
> >>>>>> investigation, please ?
> >>>>> I'm not quite sure what the issue is exactly? How does it fail to boot?
> >>>>>
> >>>>> Maxime
> >>>> Thank you,
> >>>> Sergey
> >>>>
>