On Wednesday 02 November 2022 01:08:26 Pali Rohár wrote:
On Friday 21 October 2022 21:09:55 Pali Rohár wrote:
On Thursday 20 October 2022 22:06:58 Pali Rohár wrote:
On Monday 10 October 2022 23:30:21 Sicelo wrote:
On Sun, Oct 09, 2022 at 09:33:17PM +0200, Pali Rohár wrote:
Hello!
Current u-boot from master branch does not work on n900 hw. It does not show anything on display, there just nokia logo.
In qemu it is working fine and all tests are passing. Also in qemu is display working without any problem.
Could you help me to debug it? Maybe something is printed to serial console? Or maybe serial console could be used for printf-debugging?
I just figured out that disabling CONFIG_POSITION_INDEPENDENT u-boot option make it working again. But it requires to restoring older version of lowlevel_init.S file which does not depend on POSITION_INDEPENDENT:
git checkout 7c4ad9821758f98db127e9d6864671c906c02d3b -- board/nokia/rx51/lowlevel_init.SAnd also setting CONFIG_SYS_TEXT_BASE=0x80008000 (to some value in RAM).
Hi
I have a really crude serial console setup in place now, but very little time, and even less experience with u-boot. I should be able to do the tests for you on Saturday night (UTC+2). Perhaps over IRC might be a good idea, in case I need some hand-holding, and if you still need the help by then.
Regards Sicelo
Well, I do not know where to start or how to instruct somebody who is not experienced with u-boot debugging. I think that the first step should be to look if U-Boot prints something on the serial console or not. If it prints then try to find via printf-driven-debugging place where it stuck. If it does not print anything on the console then try to setup debug early console, check if it prints something now and do same type of debugging. And if even early debug console does not work then probably initialize serial console directly in lowlevel_init.S file, prints something to serial, then move code for printing to later stage and try to figure out what is broken...
Early debug uart console can be enabled by configs/nokia_rx51_defconfig options:
CONFIG_DEBUG_UART=y CONFIG_DEBUG_UART_OMAP=y CONFIG_DEBUG_UART_SHIFT=2 CONFIG_DEBUG_UART_BASE=0x49020000 CONFIG_DEBUG_UART_CLOCK=48000000
And all debug verbose logs can be enabled by configs/nokia_rx51_defconfig options:
CONFIG_DM_DEBUG=y CONFIG_LOG=y CONFIG_LOGLEVEL=9 CONFIG_LOG_MAX_LEVEL=9 CONFIG_LOG_DEFAULT_LEVEL=9
By compiling via 'make u-boot.bin KCPPFLAGS=-DLOG_DEBUG'
Can somebody with serial console provide this debug output if there is something useful?
Can somebody help me with this?
At least in qemu it is working and printing everything.
Anybody else with serial console can look at it?
Or maybe look at the code if you spot some issue there?