Dear Mr. Ryu and Suh,
First of all, sorry for this long e-mail, although I think it can be
very useful for these people which just started taking steps in the
xen-arm world. :)
I'm working with a Quadmo747-X/T20 board, which is a Tegra2 Harmony
board, specs are in the following initial output from the serial
board's port and link:
TEGRA2
Board: Tegra2 Harmony board
DRAM: 1 GB
http://www.seco.com/en/item/quadmo747-x_t20/
I've succeeded in compiling xen-arm and linux-xen, which I obtained
from the following post:
http://lists.xen.org/archives/html/xen-devel/2012-02/msg00825.html
I used the cross-compiler which I obtained from:
https://aur.archlinux.org/packages.php?ID=48252
I tried the cross-compiler which came with the repositories in
Kubuntu 11.04, but I got some errors, that's why I tried with this
one (conveniently modifying the TOOLCHAIN_PREFIX variable in the
makefiles).
The thing is that I am able to compile the code and I obtain the
following files in xen-arm:
3434823 120K -rwxr-xr-x 1 jsubirat jsubirat 118K 2012-07-04 12:12
xen
3434635 68K -rw-r--r-- 1 jsubirat jsubirat 65K 2012-07-04 12:12
xen.gz
3434636 692K -rwxr-xr-x 1 jsubirat jsubirat 690K 2012-07-04 12:12
xen-syms
And the following ones in the linux-xen:
3436766 52M -rwxr-xr-x 1 root root 52M 2012-07-04 13:21
vmlinux
3436754 77M -rw-r--r-- 1 root root 77M 2012-07-04 13:21
vmlinux.o
I download the files into the board using the following commands:
tftpboot 0x8000 xen
tftpboot 0x1E800000 vmlinux
go 0x8000
At this point, I was expecting to see some Xen output, but instead I
obtain nothing, only "Starting application at 0x00008000" and
nothing else. I googled about it, and I found this post:
http://lists.xen.org/archives/html/xen-arm/2012-03/msg00008.html
He had the same problem as me, but I noticed that Wang was
downloading the xen file in a different memory position:
0xC0008000. I started investigating this, and I observed that in the
file xen/System.map, it says:
# cat xen/System.map
ff008000 A _start
[...]
So, I tried downloading xen in 0xC0008000 and 0xFF008000 positions,
with no success. I googled again, and I came accross with this post,
which mentions that the serial output is disabled by default in Xen:
http://web.archiveorange.com/archive/v/pyNG7oGVJuo074YY8sEI
I looked at the tegra250.c file and I saw a #if 0 preprocessor
instruction. I commented the #if 0 and the #endif, compiled again,
but still no output or anything showing any reaction.
What am I doing wrong? What can it be that causes this empty output?
Am I using a wrong direction to download xen? Should I receive some
output, even if I don't download the kernel (I ask this in order to
save some time while testing xen-arm boot, so I don't have to
download each time, until I manage to get xen-arm to work)? Many
thanks in advance.
Best regards,
Josep Subirats
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