On Tue, Aug 14, 2012 at 02:03:55PM +0200, Andreas Bießmann wrote: > On 14.08.2012 11:08, Markus Hubig wrote: > > On Tue, Aug 14, 2012 at 08:22:11AM +0200, Andreas Bießmann wrote: > >> On 27.07.12 11:16, Markus Hubig wrote:
<snipp> > >>> Has anyone an ideea how to fix this? Or what's the cause of it? Is it even > >>> related to u-boot or is it something at91bootstrap is doing wrong? > >> > >> can you please check http://patchwork.ozlabs.org/patch/107896/ > >> > >> It seems this patch was set to 'Accepted' but never applied to the > >> master repository. Unfortunately this got lost in nirvana end of last > >> year. I will apply it in any case but can you please check if it fixes > >> your problem? > > > > Unfortunately not ... but it dosen't do any harm. > > How sad! > > I wonder if this has something to do with the ominous PC9. It is > possible that this PC9 switches some vital element e.g. power supply, > 'output enable' of UART level shifter or something else which needs some > settling. Have you tried adding some delay in between setting this pin > and activating the serial port output pins? Hmm no, good idea. I tryed this in board_early_init_f(), but again with no console output at all ... | int board_early_init_f(void) | { | struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; | | /* Enable clocks for all PIOs */ | writel((1 << ATMEL_ID_PIOA) | (1 << ATMEL_ID_PIOB) | | (1 << ATMEL_ID_PIOC), &pmc->pcer); | | /* Enable the serial interface */ | at91_set_gpio_output(AT91_PIN_PC9, 1); | mdelay(1000); | at91_seriald_hw_init(); | | return 0; | } > Did you investigate the PCB? Which device is directly behind the DB9 > connector? Can you find a datasheet for that device and check if it has > some power saving features? Can you check if these power saving features > switched with the PC9? Did taskit respond to your request for detailed > information? Problem is, I don't have the circuit diagrams and taskit didn't respond yet ... > Another possible reason can be the fact that you enable the output pins > after serial port is enabled (serial_init runs way before board_init). This is what I think too! But board_early_init_f() is called befor serial_init() so this would be the place to put this, but I don't unterstand why the | at91_set_gpio_output(AT91_PIN_PC9, 1); command is not working in board_early_init_f() ... I even put this into serial_init() but again with no luck ... > Therefore your output is put into the TX register but I don't know what > happens then. Eventually the output is delayed until the output pins are > enabled in conjunction with the 'SYS' clock. Maybe the TX logic is > happily shifting the bits into nirvana until you switch on the output > pins. In conjunction with the PC9 thing this could be your problem. I'll wait what taskit says, maybe this will shine some light on this issue. Cheers, Markus _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot