* Otto Solares <solca@xxxxxxxx> [090217 13:59]: > On Tue, Feb 17, 2009 at 01:46:12PM -0800, Tony Lindgren wrote: > > * Otto Solares <solca@xxxxxxxx> [090217 13:37]: > > > Hi all! > > > > > > I want to make kexec work on current Nokia Internet Tablets but > > > maybe someone here have a clue or better if a patch :) > > > > Do you need to patch anything for this, or does it work out of the box? > > Tried with l-o out of the box and tried too with this patch applied but same > results so far: > > http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-jaunty.git;a=commit;h=6cd8dd766aec17ce66aa4f732928d05534da0937 > > Although it seems it was reverted here: > > http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-jaunty.git;a=commit;h=484b70239a16c01d706a82e5e4afe2f82f24d950 OK, thanks for the links. > > > When I run a kexec enabled linux-omap kernel and try to boot the > > > production Maemo kernel or a linux-omap kernel I only succeed if > > > the serial-console flag in r&d mode is set, if not the device > > > just hangs. > > > > Sounds like something does not get correctly initialized.. > > > > > It seems as a timing problem because if I insert small delays to > > > the kexeced kernel via CONFIG_BOOT_PRINTK_DELAY it works too > > > without the serial-console flag set. > > > > > > Any idea what to debug or where to start? > > > > Well since the LCD is on, you could write a little function that > > writes the output to the LCD. You just need to find out the virtual > > address of the LCD and then add a function for displaying fonts.. > > Pretty easy to do. > > Ok, btw do you known a function name I should patch with the debugging > output? We have the DEBUG_LL patch in l-o tree that's for low-level debug output to serial port. You could could add a function called printlcd() and call that instead of printascii(). > > BTW, do you have some Maemo package for kexec? > > Nope, although I host a userland patch and the statically compiled binary > here: > > http://guug.org/nit/kexec/ Great, it would be nice to switch between Maemo and whatever easily. Tony
--- a/kernel/printk.c +++ b/kernel/printk.c @@ -44,6 +44,10 @@ void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...) #define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT) +#ifdef CONFIG_DEBUG_LL +extern void printascii(char *); +#endif + /* printk's without a loglevel use this.. */ #define DEFAULT_MESSAGE_LOGLEVEL 4 /* KERN_WARNING */ @@ -668,6 +672,9 @@ asmlinkage int vprintk(const char *fmt, va_list args) printed_len += vscnprintf(printk_buf + printed_len, sizeof(printk_buf) - printed_len, fmt, args); +#ifdef CONFIG_DEBUG_LL + printascii(printk_buf); +#endif /* * Copy the output into log_buf. If the caller didn't provide
