Re: [U-Boot] [PATCH 2/2] riscv: Access CSRs using CSR numbers

1 Aug 2019

      Rick Chen rickchen36@gmail.com 於 2019年7月18日 週四 上午11:25寫道：
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From: Bin Meng [mailto:bmeng.cn@gmail.com]
Sent: Thursday, July 11, 2019 2:43 PM
To: Rick Jian-Zhi Chen(陳建志); Anup Patel; Lukas Auer; U-Boot Mailing List
Subject: [PATCH 2/2] riscv: Access CSRs using CSR numbers
We should prefer accessing CSRs using their CSR numbers
because:

It compiles fine with older toolchains.
We can use latest CSR names in #define macro names of CSR
numbers as-per RISC-V spec.
We can access newly added CSRs even if toolchain does not
recognize newly added CSRs by name.

This commit is inspired from Linux kernel commit a3182c91ef4e
("RISC-V: Access CSRs using CSR numbers").
Signed-off-by: Bin Meng bmeng.cn@gmail.com
arch/riscv/cpu/cpu.c              |   9 +-
 arch/riscv/cpu/start.S            |   3 +-
 arch/riscv/include/asm/csr.h      |  12 ++
 arch/riscv/include/asm/encoding.h | 238 +-------------------------------------
 4 files changed, 19 insertions(+), 243 deletions(-)
Applied to u-boot-riscv/master, thanks!
Rick