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riscv: kconfig: introduce SPL_LOAD_FIT_OPENSBI_OS_BOOT symbol

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Introduce common Kconfig symbol for riscv architecture.
This symbol SPL_LOAD_FIT_OPENSBI_OS_BOOT is like falcon mode on ARM,
the Falcon boot is a shortcut boot method for SD/eMMC targets. It
skips the loading the RAM version U-Boot. Instead, it will loads
the FIT image and boots directly to Linux.

When SPL_OPENSBI_OS_BOOT is enabled, linux.itb is created after
compilation instead of the default u-boot.itb. It initialises memory
with the U-Boot SPL at the first stage, just as a normal boot process
does at the beginning. Instead of jumping to the U-Boot proper from
OpenSBI before booting the Linux kernel, the RISC-V falcon mode
process jumps directly to the Linux kernel to gain shorter booting time.

Signed-off-by: Randolph <randolph@andestech.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Randolph
2023-10-19 17:29:33 +08:00
committed by Leo Yu-Chi Liang
parent 5367b9e798
commit e09a2287c1
1 changed files with 8 additions and 0 deletions
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arch/riscv/Kconfig
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@@ -424,4 +424,12 @@ config TPL_USE_ARCH_MEMSET
endmenu
config SPL_LOAD_FIT_OPENSBI_OS_BOOT
bool "Enable SPL (OpenSBI OS boot mode) applying linux from FIT"
depends on SPL_LOAD_FIT
help
Use fw_dynamic from the FIT image, and u-boot SPL will invoke it directly.
This is a shortcut boot flow, from u-boot SPL -> OpenSBI -> u-boot proper
-> linux to u-boot SPL -> OpenSBI -> linux.
endmenu