Re: [Qemu-devel] [PATCH v15 00/10] ARM: Samsung Exynos4210-based boards support.

[Peter Maydell]

On 10 February 2012 05:36, Evgeny Voevodin <address@hidden> wrote:
> This set of patches adds support for Samsung Exynos4210-based boards NURI and 
> SMDKC210.
> Tested on Linux kernel v3.x series.

> Boot smdkc210 board with root filesystem on NFS disk and serial port #0 
> redirected to terminal
> # qemu-system-arm -kernel ./zImage -append "console=ttySAC0,115200n8 ip=dhcp 
> root=/dev/nfs nfsroot=10.0.2.2:/srv/nfs/ rw " -serial stdio -M smdkc210

Have you tried booting this with the 'earlyprintk' kernel option?
I tried this with a 3.2.0 kernel and the exynos4 defconfig and it
crashes (without 'earlyprintk' is fine). What seems to be happening
is that the printk() in s3c_init_cpu() ends up taking an abort
trying to read the UART status register in the waituart macro.
This load has worked fine up until this point (with the same
address being used for the load) but I have a feeling this is the
first printk after we've done some fiddling with the memory mapping
of devices. Presumably without 'earlyprintk' we don't try to
do this output and will dump the whole printk buffer later via
a different codepath.

Possibly this is a kernel bug but I'll let you track it down :-)

-- PMM