On 09/02/2014 05:09 PM, Xuetao Guan wrote:
[...]
unicore32: Add ocd console and qemu-defconfig to support qemu simulator
This patch adds a primitive OCD console to communicate with qemu.
The same code is already used for early console support.
Do you mean there's the same/similar code in QEMU.
No, I mean that the ocd functions in the linux kernel (such as ocd_putc) are
used by both earlyprintk and the ocd console code.
Yes. By the way, it's only for qemu and fpga debug.
With this patch added, and with qemu_defconfig as provided by the same patch,
it is possible to build and load a unicore32 image in qemu using the following
qemu command line.
qemu-system-unicore32 -curses -M puv3 -m 512 -kernel arch/unicore32/boot/zImage
Caveats:
- The use of -nographic instead of -curses causes a qemu crash
Yes, since qemu curses code was modified to meet the simple OCD console
requirement.
The lack of support for -nographic is a problem for scripted testing.
The issue is that we have to interpret console output for scripted testing,
and having to go through curses makes that a bit difficult.
Wonder if '-nographic' can be modeled as '-curses' with no available terminal
configuration. At least in theory that should work, but executing the above
command with TERM=dumb yields no output. Wonder how difficult it would be to
change that.
I see. I'll try to make -nographic work anyway.
Another possibility would be to support "-display none". Unfortunately that also
causes qemu to crash :-(.
Guenter
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