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[Qemu-devel] Re: SH: support 7785 serial

From: Vladimir Prus
Subject: [Qemu-devel] Re: SH: support 7785 serial
Date: Mon, 06 Apr 2009 19:23:57 +0400
User-agent: KNode/0.10.9

Shin-ichiro KAWASAKI wrote:

> Hi, Vladimir.
> Thank you for your work.
> Vladimir Prus wrote:
>> These 3 patches make sh_serial.c support 7785 serial. The primary
>> difference is that on 7785, instead of single fifo count register
>> there are two separate ones -- for rx and tx. Patch 3 adds necessary
>> conditional logic. Patches 1 and 2 are cleanups that I've done alone
>> the way:
>> - Patch 1 makes it possible to change the size of RX fifo. It's 16
>> on 7751 and 64 on 7785. While I do not know of any breakage if we
>> use wrong size, it's still best to be correct.
>> - Patch 2 replaces a pile of hardcoded constants with macroses.
>> Also, the FSR register was handled strangely -- when written, we'd
>> look at the written value and set bits in the 'flags' field, and on
>> read, we'd reconstruct the value from the 'flags' field. There does
>> not seem to be any reason for such roundabout, so I've made the code
>> work with 'sr' directly.
>> This patch was tested both with r2d, using kernel and userland found
>> at:
>> thttp://www.assembla.com/wiki/show/qemu-sh4/BuildingEnvironment
>> and with 7785, using a hand-made kernel.
> Patch 2 produces a trouble in my environment.
> For r2d, the output to SCIF from kernel is OK, but output from
> shell is broken by inserted white space, like follows.
> (before applying patch 2)
>  # ls
> (after applying patch2)
>  #    l  s
> Do you have time to investigate it?


I could not reproduce this locally. Did you tried typing this in virtual console
that QEMU pops up, or in the console where QEMU was started. For me, the former
does not accept any input at all.

Would it be possible for you to provide me with
- Source tree of qemu that you've tested this with? Pointer to some git commit
in some branch in some git repository will be OK.
- The kernel zImage you have used it
- The disk image you have used
- The command line for qemu

For the latter three, I have used what you have put at:


but I want to be sure there's no accidental differences. And for qemu source 
I want to make sure I did not unintentially based by patch on some wrong state.


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