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Answer 1

+2 A:

It appears that QEMU does not emulate the VGA device in its Arm integrator emulation.

Check out this link for a possible workaround.

bdk 2009-06-24 02:14:35

Yeah, I was wondering about that. I hit that link before, it looks like they're using a different machine emulation (versatilepb). I've been able to boot into that before. But then I found a Chinese website which seems to imply that what I'm trying to do can be done. I can't tell though because I can't read Chinese.In case anyone's interested:http://blog.chinaunix.net/u1/34715/showart_1269885.html

2009-06-24 18:13:48

thank you for your reply, by the way!

2009-06-24 18:14:21

Answer 2

A:

What is the kernel command line ? You shoul first put the console on the serial port using a line like this :

console=/dev/ttyS0 or console=/dev/ttyAMA0

Then the messages should start to flow. If your kernel dies too early, you can also try the following hack :

Index: .kernel/kernel/printk.c
===================================================================
--- .kernel.orig/kernel/printk.c    2009-02-28 02:52:32.000000000 +0100
+++ .kernel/kernel/printk.c 2009-04-30 14:12:29.000000000 +0200
@@ -41,6 +41,7 @@
 {
 }

+extern void printascii(const char *);
 #define __LOG_BUF_LEN  (1 << CONFIG_LOG_BUF_SHIFT)

 /* printk's without a loglevel use this.. */
@@ -552,7 +553,7 @@

    /* Emit the output into the temporary buffer */
    printed_len = vscnprintf(printk_buf, sizeof(printk_buf), fmt, args);
-
+        printascii(printk_buf);
    if (printed_len > 0) {
     unsigned int loglevel;
     int mark_len;

shodanex 2009-06-24 07:40:07

Shodanex,This is ON POINT. Worked like a charm. I was planning on doing something like this but had no idea how to approach it. Is this your own? If not, where did you discover it? How did you know this would work? Where does printascii come from?Thanks for your help!

2009-06-24 18:16:01

I have been working with various ARM processor on custom hardware, and if you did not get it right the first time, then you need at least some debugging help. serial console is a standard on ARM, and the printascii hack regularly show up on ARM linux mailing list when people are stuck with a silently failing kernel.

shodanex 2009-06-25 07:54:48

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