use generic DMA mapping code in powerpc V4

[Christian Zigotzky]

> On 12. Dec 2018, at 01:47, Benjamin Herrenschmidt <benh at kernel.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