linux-kernel - Re: use generic DMA mapping code in powerpc V4

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Date:   Wed, 12 Dec 2018 08:03:26 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
        Darren Stevens <darren@...vens-zone.net>,
        linux-kernel@...r.kernel.org, Julian Margetson <runaway@...dw.ms>,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Paul Mackerras <paulus@...ba.org>,
        Olof Johansson <olof@...om.net>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: use generic DMA mapping code in powerpc V4



> On 12. Dec 2018, at 01:47, Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> 
>> On Tue, 2018-12-11 at 19:17 +0100, Christian Zigotzky wrote:
>> X5000 (P5020 board): U-Boot loads the kernel and the dtb file. Then the 
>> kernel starts but it doesn't find any hard disks (partitions). That 
>> means this is also the bad commit for the P5020 board.
> 
> What are the disks hanging off ? A PCIe device of some sort ?
> 
> Can you send good & bad dmesg logs ?
> 
> Ben.
> 
> 
Unfortunately not. It doesn’t detect any hard disk. That means the kernel ring buffer won’t save to log files. I don’t have a serial null modem cable for seeing all output. We use SATA disks. I will investigate more in this problem with rollback the files in the bad commit.

— Christian