Re: [PATCH v4 00/20] Add Allwinner H3 SoC and Orange Pi PC Machine

[Philippe Mathieu-Daudé]

On 2/12/20 10:47 PM, Niek Linnenbank wrote:
> Hi all,
>
> Short status update regarding this series.
>
> Currently I am debugging booting NetBSD 9.0-RC2, which is recently 
> released [1]
> The problem is that, apparently, RC2 can't mount the rootfs properly:
>
> [   3.1871510] vfs_mountroot: can't open root device
> [   3.2141370] cannot mount root, error = 6
>
> This only happens using the RC2 filesystem image. However, the RC2 
> kernel can
> properly load & boot the RC1 filesystem image, and the RC1 kernel gives 
> the same error
> on the RC2 filesystem.  But I dont think its a NetBSD-RC2 issue, because 
> on a real
> Orange Pi PC hardware board, this problem does not show.

Linux shows:
  console: mmc0: Problem switching card into high-speed mode!

QEMU MMC support is not in good shape, and high-speed SD card support is 
limited. I keep procrastinating at reviewing your SDHCI patch hmmmmm.

So you added:

 * DMA transfers
 * Direct FIFO I/O
 * Short/Long format command responses

I'd start diffing the trace output of the following events:

allwinner_sdhost*
sdcard*

with both kernels.

> I'm comparing traces and adding more low-level debug output to NetBSD 
> and QEMU to find the issue.
>
> Also I processed the review remarks which were send so far.
>
> Kind regards,
> Niek
>
> [1] https://www.netbsd.org/releases/formal-9/NetBSD-9.0.html