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

From: Philippe Mathieu-Daudé
Subject: Re: [PATCH v4 00/20] Add Allwinner H3 SoC and Orange Pi PC Machine
Date: Wed, 12 Feb 2020 23:12:08 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

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:


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,

[1] https://www.netbsd.org/releases/formal-9/NetBSD-9.0.html

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