On 15.02.2012 07:23, Evgeny Voevodin wrote:
On 14.02.2012 23:51, Peter Maydell wrote:
On 10 February 2012 05:36, Evgeny Voevodin<e.voevo...@samsung.com> 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
Some times ago we have tried it but not recently. Will check it and
report. Thanks.
My suggestion is that this is a kernel issue. Try latest 3.3-rc3. It
works with "earlyprintk", though I can't see any valuable difference in
output.
Also, make attention to what config says:
"Say Y here if you want the debug print routines to direct
their output to UART 0. The port must have been initialised
by the boot-loader before use."
We do not have appropriate bootloader, though 3.3-rc3 works without it.
--
Kind regards,
Evgeny Voevodin,
Leading Software Engineer,
ASWG, Moscow R&D center, Samsung Electronics
e-mail: e.voevo...@samsung.com
