On 10/12/20 6:50 PM, Peter Robinson wrote: > On Mon, Oct 12, 2020 at 3:56 PM Heinrich Schuchardt <[email protected]> > wrote: >> >> Hello Matthias, >> >> I have upgraded the Raspberry 3 firmware from raspi3-firmware >> (1.20190215-1+deb10u4) to raspi-firmware (1.20200601-3) >> [https://packages.debian.org/bullseye/raspi-firmware]. >> >> After the upgrade the output of U-Boot on the serial console is complete >> gibberish as if the baudrate were incorrect. The output from the Linux >> kernel is fine at 115200 baud. > > I've seen similar on all firmware since around mid April up until > recently, it seems to be fixed with releases in Oct (I'm using one > from Oct 8th), I'm not sure if it can be fixed in U-Boot but it seems > to be due to a change in the firmware.
Thanks for confirming the problem. Using the most current files from https://github.com/raspberrypi/firmware does not solve the problem for me. In bcm283x_mu_serial_setbrg() we divide a clock rate by the baudrate. divider = plat->clock / (baudrate * 8); If we do not have the correct clock rate, the actual baudrate will be wrong. Best regards Heinrich > >> I observe this both with rpi_3_defconfig and rpi_arm64_defconfig, >> v2020.10 and current origin/master. >> >> config.txt: >> >> arm_control=0x200 >> enable_uart=1 >> upstream_kernel=1 >> kernel=u-boot.bin >> >> boot.scr: >> setenv autoload no >> dhcp >> load mmc 0:1 $fdt_addr_r bcm2710-rpi-3-b-plus.dtb >> load mmc 0:2 $kernel_addr_r EFI/debian/grubaa64.efi >> bootefi $kernel_addr_r $fdt_addr_r >> >> Best regards >> >> Heinrich
