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.S > > > > > > And 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' 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?
