Hi, I am new. I am trying to figure out the right pogo pins to get in order to try to build a serial port for N900. But I am trying to decipher the docs in the wiki at the moment.
Best, -- Ashish Shah On Wed, Nov 9, 2022, at 2:33 PM, Pali Rohár wrote: > 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.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' >> >> 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? > _______________________________________________ > Maemo-Leste mailing list > maemo-le...@lists.dyne.org > https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/maemo-leste