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riscv: Add support for SPI on Kendryte K210

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This enables configs necessary for using SPI. The environment is saved to
the very end of SPI flash. This is unlikely to be overwritten unless the
entire flash is reprogrammed.

This also supplies a default bootcommand. It loads an image and device tree
from the first partition of the MMC. This is a minimal/least effort
bootcmd, so suggestions (especially in the form of patches) are welcome. I
didn't set up distro boot because I think it is unlikely that any
general-purpose linux distros will ever be ported to this board.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Tested-by: Chrstopher Obbard <obbardc@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>
This commit is contained in:
Sean Anderson
2020-12-22 18:57:18 -05:00
committed by Andes
parent 24c5689447
commit 8f78e52794
4 changed files with 301 additions and 52 deletions
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7
include/configs/sipeed-maix.h
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@@ -24,10 +24,13 @@
#ifndef CONFIG_EXTRA_ENV_SETTINGS
#define CONFIG_EXTRA_ENV_SETTINGS \
"loadaddr=0x80060000\0" \
"fdt_addr_r=0x80028000\0" \
"fdt_addr_r=0x80400000\0" \
"scriptaddr=0x80020000\0" \
"kernel_addr_r=0x80060000\0" \
"fdtfile=kendryte/" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0"
"fdtfile=kendryte/" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0" \
"k210_bootcmd=load mmc 0:1 $loadaddr /uImage && " \
"load mmc 0:1 $fdt_addr_r /k210.dtb && " \
"bootm $loadaddr - $fdt_addr_r\0"
#endif
#endif /* CONFIGS_SIPEED_MAIX_H */