This patch adds support for Xilinx Kria KR260 starter kit.
KR260 features can be found here:
https://www.xilinx.com/products/som/kria/kr260-robotics-starter-kit.html
While the Kria SOM is based on a ZynqMP SoC, there are some key
boot config differences from the other ZynqMP evaluation boards.
1. There are no boot switches on Kria SOMs. The boot mode is thus
hard configured for QSPI flash. A pre-programmed boot.bin comes
with every Starter Kit. U-Boot can then find the Linux kernel and
file system on the SD card.
Optional instructions for updating the boot.bin in the QSPI flash
can be found in the readme.txt file and the link below.
https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/1641152513/Kria+K26+SOM
2. Kria SOMs use UART1 for the console instead of UART0. For this
reason, Kria Starter Kits will use a separate extlinux.conf file
from other ZynqMP evaluation boards.
3. The KR260 has a USB to SD card bridge, so the Linux kernel
and file system are found on /dev/sda1 and /dev/sda2.
Signed-off-by: Neal Frager <neal.frager@amd.com>
[Peter: fix kr260.sh shellcheck warnings, similar to kv260.sh]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
