On 11/8/22 16:05, Bin Meng wrote:
Hi Heinrich,
On Tue, Nov 8, 2022 at 10:53 PM Heinrich Schuchardt heinrich.schuchardt@canonical.com wrote:
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
arch/riscv/Kconfig | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 4d64e9be3f..ebc4bef220 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -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 morescalable and extendable to handle future needs for RISC-V supervisorinterfaces. For example, with SBI v0.2 HSM extension, only a singlehart need to boot and enter operating system. The booting hart canbring up secondary harts one by one afterwards.
The SBI specification introduced the concept of extensions in versionv0.2. With this configuration option U-Boot can detect and use SBIextensions. With the HSM extension introduced in SBI 0.2, only asingle hart needs to boot and enter the operating system. The bootinghart 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
I remember this option was borrowed from the Linux kernel. Do you plan to send patch to Linux kernel too?
Linux uses a single configuration symbol CONFIG_RISCV_SBI_V01 "SBI v0.1 support"
So there is no need for a change there.
SBI v0.1 is really obsolete. Can we drop support for it in U-Boot?
Best regards
Heinrich