[OpenBIOS] [PATCH] ppc: fix ESCC reg properties

[Programmingkid]

On Feb 4, 2016, at 4:55 PM, Alyssa Milburn wrote:

> On Wed, Feb 03, 2016 at 09:58:50PM +0000, Mark Cave-Ayland wrote:
>> Note that currently we don't add the DBDMA properties at the end of the
>> reg property because QEMU doesn't yet support serial DBDMA, but perhaps
>> it is time to start turning on DBDMA logging to see if this is what's is
>> causing OT to get stuck.
>> 
>> In fact, do we know if OT ever worked on MOL at all or did it provide
>> its own drivers?
> 
> In any case, MOL has a comment /* this hack keeps MacOS 9 happy */ just
> above the point where it enables serial DBDMA on ch-b, so that sounds
> like a rather big hint for us. I might go try this now..

I did a little research and found out that some of the properties of the escc-legacy's ch-a and ch-b nodes are wrong. 

ftp://ftp.software.ibm.com/rs6000/technology/spec/chrp/inwork/CHRP_IORef_1.0.pdf
According to this CHRP specifications, page 246, the escc-legacy node is suppose to have a "ranges" property. This is missing. It is also missing the #size-cells properties. The escc-legacy/ch-a node also looks like it's device_type property should be "legacy" rather than serial.