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Re: [Qemu-devel] qemu-system-sh4 broken again.
From: |
Rob Landley |
Subject: |
Re: [Qemu-devel] qemu-system-sh4 broken again. |
Date: |
Sun, 14 Mar 2010 18:08:40 -0600 |
User-agent: |
KMail/1.11.2 (Linux/2.6.28-18-generic; KDE/4.2.2; x86_64; ; ) |
On Sunday 14 March 2010 16:28:32 Aurelien Jarno wrote:
> On Sat, Mar 13, 2010 at 05:11:43PM -0600, Rob Landley wrote:
> > I found out that "-serial stdio" is apparently trying to open /dev/stdio,
> > which Ubuntu 9.04 hasn't got. If I say -serial /dev/tty it works from
> > the command line (but not in scripts).
>
> This is actually not specific at all to sh4. See this thread:
> http://www.mail-archive.com/address@hidden/msg20920.html
http://www.mail-archive.com/address@hidden/msg22763.html
> This is redundant. -nographic implies -serial stdio.
Trying with just -nographic and no -serial lines, I get:
$ qemu-system-sh4 -M r2d -nographic -no-reboot -kernel zImage-sh4 -hda image-
sh4.sqf -append "root=/dev/sda rw init=/usr/sbin/init.sh panic=1 PATH=/usr/bin
console=ttySC0 noiotrap HOST=sh4"
long read to SH7750_WCR1_A7 (0x000000001f800008) ignored
long read to SH7750_WCR2_A7 (0x000000001f80000c) ignored
long read to SH7750_WCR3_A7 (0x000000001f800010) ignored
long read to SH7750_MCR_A7 (0x000000001f800014) ignored
long read to SH7750_MCR_A7 (0x000000001f800014) ignored
And it hangs. No output from any of the kernel serial writes.
http://www.mail-archive.com/address@hidden/msg22775.html
> > eg this should work as you'd expect it
> >
> > qemu -nodefaults -nographic -serial stdio
>
> -nographic is basically equivalent to -serial mon:stdio,signal=on -vga none
> except it operates on defaults. Your invocation actually ends up being very
> different as it doesn't multiplex the monitor and it doesn't disable ctrl-c.
> Basically, your invocation is equivalent to qemu -vga none -serial stdio
http://www.mail-archive.com/address@hidden/msg22775.html
$ qemu-system-sh4 -M r2d -nographic -no-reboot -kernel zImage-sh4 -hda image-
sh4.sqf -append "root=/dev/sda rw init=/usr/sbin/init.sh panic=1 PATH=/usr/bin
console=ttySC0 noiotrap HOST=sh4" -vga none -serial stdio
chardev: opening backend "stdio" failed
qemu: could not open serial device 'stdio': Inappropriate ioctl for device
http://www.mail-archive.com/address@hidden/msg22777.html
$ qemu-system-sh4 -M r2d -nodefaults -nographic -serial stdio -no-reboot -
kernel zImage-sh4 -hda image-sh4.sqf -append "root=/dev/sda rw
init=/usr/sbin/init.sh panic=1 PATH=/usr/bin console=ttySC0 noiotrap HOST=sh4"
long read to SH7750_WCR1_A7 (0x000000001f800008) ignored
long read to SH7750_WCR2_A7 (0x000000001f80000c) ignored
long read to SH7750_WCR3_A7 (0x000000001f800010) ignored
long read to SH7750_MCR_A7 (0x000000001f800014) ignored
long read to SH7750_MCR_A7 (0x000000001f800014) ignored
And the hang's back, no output...
Ok, this seems to work:
qemu-system-sh4 -M r2d -nodefaults -nographic -serial null -serial stdio -no-
reboot -kernel zImage-sh4 -hda image-sh4.sqf -append "root=/dev/sda rw
init=/usr/sbin/init.sh panic=1 PATH=/usr/bin console=ttySC0 noiotrap HOST=sh4"
I no longer even pretend to know why...
Do I have to say "-nodefaults" on every other target as well to disable the
unwanted monitor I never knew was there?
Rob
--
Latency is more important than throughput. It's that simple. - Linus Torvalds