Hi Heinrich > From: Heinrich Schuchardt <heinrich.schucha...@canonical.com> > Sent: Tuesday, November 08, 2022 11:14 PM > To: Bin Meng <bmeng...@gmail.com> > Cc: Rick Jian-Zhi Chen(陳建志) <r...@andestech.com>; Leo Yu-Chi Liang(梁育齊) > <ycli...@andestech.com>; Conor Dooley <conor.doo...@microchip.com>; > u-boot@lists.denx.de > Subject: Re: [PATCH 1/1] riscv: clarify meaning of CONFIG_SBI_V02 > > On 11/8/22 16:05, Bin Meng wrote: > > Hi Heinrich, > > > > On Tue, Nov 8, 2022 at 10:53 PM Heinrich Schuchardt > > <heinrich.schucha...@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.schucha...@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 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 > > > > 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?
I am fine to remove it. Thanks, Rick
