Re: [Qemu-devel] Booting custom kernel in qemu

[Andreas Färber]

Am 28.05.2011 um 22:05 schrieb Apelete Seketeli:

> On 27-May-11, Amit Shah wrote:
> > On (Thu) 26 May 2011 [21:59:01], Apelete Seketeli wrote:
> > > I wanted to launch the kernel in a terminal for practical  
> > > purposes, so
> > > I tried:
> > >
> > > qemu -kernel bzImage -append console=ttyS0
> >
> > Add -serial stdio to get those logs.
>
> [...] For the time being I'm using
>
> qemu -kernel bzImage -append console=ttyS0 -S -nographic
>
> in order to launch gdbserver in the monitor and attach a gdb in the
> host; [...]

You can use -S -s or -S -gdb ... for that.

> $ qemu -S -kernel arch/x86/boot/bzImage -append console=ttyS0 - 
> nographic -serial stdio
> chardev: opening backend "stdio" failed
> qemu: could not open serial device 'stdio': No such file or directory
>
> Why do I get an error since stdio is (according to the manual) the
> standard device in non graphical mode ?

-nographic implies -serial stdio, so it's redundant. When using SDL or  
Cocoa, -serial stdio gives you serial on the console in addition to  
the graphical window. -nographic just gives you the console output.

HTH,
Andreas