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riscv: clarify meaning of CONFIG_SBI_V02

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Describe that CONFIG_SBI_V02=y does not mean SBI specification v0.2
but v0.2 or later.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Rick Chen <rick@andestech.com>
This commit is contained in:
Heinrich Schuchardt 2022-11-08 15:53:12 +01:00 committed by Leo Yu-Chi Liang
parent c277c787a0
commit 5c89467262
1 changed files with 7 additions and 7 deletions
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14
arch/riscv/Kconfig
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@ -257,16 +257,16 @@ config SBI_V01
deprecated in future once legacy M-mode software are no longer in use.
config SBI_V02
bool "SBI v0.2 support"
bool "SBI v0.2 or later support"
depends on SBI
help
This config allows kernel to use SBI v0.2 APIs. SBI v0.2 is more
scalable and extendable to handle future needs for RISC-V supervisor
interfaces. For example, with SBI v0.2 HSM extension, only a single
hart need to boot and enter operating system. The booting hart can
bring up secondary harts one by one afterwards.
The SBI specification introduced the concept of extensions in version
v0.2. With this configuration option U-Boot can detect and use SBI
extensions. With the HSM extension introduced in SBI 0.2, only a
single hart needs to boot and enter the operating system. The booting
hart can bring up secondary harts one by one afterwards.
Choose this option if OpenSBI v0.7 or above release is used together
Choose this option if OpenSBI release v0.7 or above is used together
with U-Boot.
endchoice