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[v2,5/6] riscv: Add Kconfig option for SBI v0.2

Message ID 1587049773-1464-6-git-send-email-bmeng.cn@gmail.com
State Accepted
Commit ff0fa6c1b31b6b48db7864dd01819842d6c02648
Delegated to: Andes
Headers show
Series riscv: Make SBI v0.2 the default SBI version to work with OpenSBI v0.7 | expand

Commit Message

Bin Meng April 16, 2020, 3:09 p.m. UTC 
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.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
---

Changes in v2: None

 arch/riscv/Kconfig | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index a252cdb..c729871 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -226,14 +226,32 @@  config SBI
 	bool
 	default y if RISCV_SMODE || SPL_RISCV_SMODE
 
+choice
+	prompt "SBI support"
+	default SBI_V01
+
 config SBI_V01
 	bool "SBI v0.1 support"
-	default y
 	depends on SBI
 	help
 	  This config allows kernel to use SBI v0.1 APIs. This will be
 	  deprecated in future once legacy M-mode software are no longer in use.
 
+config SBI_V02
+	bool "SBI v0.2 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.
+
+	  Choose this option if OpenSBI v0.7 or above release is used together
+	  with U-Boot.
+
+endchoice
+
 config SBI_IPI
 	bool
 	depends on SBI