Hi,
Zybo Z7 board uses 100 MHz clock for UART bitrate generator, in defconfig is 50 MHz listed. This error manifests itself when boot starts, following is seen on console:
������b U-Boot SPL 2019.01 (Jul 17 2019 - 21:36:54 +0200) mmc boot Trying to boot from MMC1
First line is output with wrong bitrate. After changing definition to correct value, boot output starts correctly, now:
Debug uart enabled
U-Boot SPL 2019.10 (Jan 09 2020 - 08:18:37 +0100) mmc boot Trying to boot from MMC1
(Please ignore version change, I just used this occasion to fix some other issues as well.)
Patch to fix this small issue follows. As this is my first contribution to this project, please help me with what could be necessary to do for this fix to be accepted, in order to fit any custom used here...
Regards, Milan
--- configs/zynq_zybo_z7_defconfig.orig 2020-01-09 08:16:33.744969000 +0100 +++ configs/zynq_zybo_z7_defconfig 2020-01-09 07:49:33.181891000 +0100 @@ -5,7 +5,7 @@ CONFIG_SPL_STACK_R_ADDR=0x200000 CONFIG_SPL=y CONFIG_DEBUG_UART_BASE=0xe0001000 -CONFIG_DEBUG_UART_CLOCK=50000000 +CONFIG_DEBUG_UART_CLOCK=100000000 CONFIG_DEBUG_UART=y CONFIG_DISTRO_DEFAULTS=y CONFIG_SYS_CUSTOM_LDSCRIPT=y