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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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11
configs/sipeed_maix_bitm_defconfig
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@@ -1,8 +1,19 @@
CONFIG_RISCV=y
CONFIG_ENV_SIZE=0x1000
CONFIG_ENV_OFFSET=0xfff000
CONFIG_ENV_SECT_SIZE=0x1000
CONFIG_TARGET_SIPEED_MAIX=y
CONFIG_ARCH_RV64I=y
CONFIG_STACK_SIZE=0x100000
CONFIG_USE_BOOTCOMMAND=y
CONFIG_BOOTCOMMAND="run k210_bootcmd"
CONFIG_HUSH_PARSER=y
CONFIG_MTDIDS_DEFAULT="nor0=spi3:0"
CONFIG_MTDPARTS_DEFAULT="nor0:1M(u-boot),0x1000@0xfff000(env)"
# CONFIG_NET is not set
# CONFIG_INPUT is not set
CONFIG_SF_DEFAULT_BUS=3
# CONFIG_DM_ETH is not set
CONFIG_FS_EXT4=y
CONFIG_FS_FAT=y
# CONFIG_EFI_LOADER is not set