On 02.12.24 15:15, Konstantin Kletschke wrote: > On Mon, Dec 02, 2024 at 01:41:26PM +0100, Ahmad Fatoum wrote: > I thought about the PMIC handling. I see barebox does not do anything > with it, relies on reset default and sets CPU speed to 500MHz in > lowlevel.c: > > am33xx_pll_init(MPUPLL_M_500, DDRPLL_M_400); > > Which is totally reasonable, the voltage is 1,1V then in this mode after > powerup. > > u-boot seems (I am not 100% sure) to set 1,3V but goes 1000MHz, which is > reasonable too. So there is a difference but not a fatal one. > > May I kindly aask how to properly enable the LL debugging? > > I do "make am335x_mlo_defconfig", disable CONFIG_MTD and set > > CONFIG_DEBUG_LL=y > CONFIG_DEBUG_OMAP_UART=y > CONFIG_DEBUG_AM33XX_UART=y > CONFIG_DEBUG_OMAP_UART_PORT=0 > > and compile a new MLO and copy it over. Does the other part barebox.bin > need to be handled the same? You can enable it for barebox.bin too, but enabling it for MLO only should work too. > The normal serial console I use is attached to UART0, is it save to use > UART_PORT 0 here also? Yes, that would be my expectation. > This starts well on cold boot, I get some additional non readable chars > at startup, like this: > > 2~�W-�,-H] > ���k�ҫ�.LWC�C�C��arebox 2024.10.0-00152-g53c99b9f550b-dirty #15 Mon Dec 2 15:07:37 CET 2024 Hmm, CONFIG_BAUDRATE is set correctly? > On "reset" or S1 I get no output at all, like without LL debug. > > I will try to move the 4 lines in lowlevel.c like you suggested... If it doesn't work at a later place, it won't work when you move it earlier. I have a BBB here, so I can give enabling DEBUG_LL a try too if you get stuck. Cheers, Ahmad > > Regards > Konstantin > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
