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Subject: [PATCH v4 0/3] RISC-V S-mode support

This patchset allows us runing u-boot in S-mode which is useful on platforms where M-mode runtime firmware is an independent firmware and u-boot is used as last stage OS bootloader.

The patchset based upon git://git.denx.de/u-boot-riscv.git

Hi Anup

I apply your patch-sets fail on u-boot-riscv.git Can you tell me which commit id I shall base on ?

Rick

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and is tested on QEMU in both M-mode and S-mode.

For S-mode testing, we have used u-boot.bin as payload of latest BBL (at commit 6ebd0f2a46255d0c76dad3c05b16c1d154795d26) applied with following changes:

diff --git a/machine/emulation.c b/machine/emulation.c index 132e977..def75e1 100644 --- a/machine/emulation.c +++ b/machine/emulation.c @@ -162,6 +162,12 @@ static inline int emulate_read_csr(int num, uintptr_t mstatus, uintptr_t* result

switch (num) {

• case CSR_MISA:

•  *result = read_csr(misa);
  

•  return 0;
  

• case CSR_MHARTID:

•  *result = read_csr(mhartid);
  

•  return 0;
  

  case CSR_CYCLE: if (!((counteren >> (CSR_CYCLE - CSR_CYCLE)) & 1)) return -1;

Changes since v3:

• Replaced 'u-boot' with 'U-Boot' in commit message
• Dropped 'an' in RISCV_SMODE kconfig option help message
• Added appropriate #ifdef in arch/riscv/lib/interrupts.c

Changes since v2:

• Dropped 'default n" from RISCV_SMODE kconfig option
• Replaced '-smode_' in defconfig names with '_smode_'

Changes since v1:

• Rebased upon latest git://git.denx.de/u-boot-riscv.git
• Add details in cover letter for running u-boot in S-mode using BBL

Anup Patel (3): riscv: Add kconfig option to run U-Boot in S-mode riscv: qemu: Use different SYS_TEXT_BASE for S-mode riscv: Add S-mode defconfigs for QEMU virt machine

arch/riscv/Kconfig | 5 ++++ arch/riscv/cpu/start.S | 33 +++++++++++++++++++++++ arch/riscv/include/asm/encoding.h | 2 ++ arch/riscv/lib/interrupts.c | 36 +++++++++++++++++++------- board/emulation/qemu-riscv/Kconfig | 3 ++- board/emulation/qemu-riscv/MAINTAINERS | 2 ++ configs/qemu-riscv32_smode_defconfig | 10 +++++++ configs/qemu-riscv64_smode_defconfig | 11 ++++++++ 8 files changed, 92 insertions(+), 10 deletions(-) create mode 100644 configs/qemu-riscv32_smode_defconfig create mode 100644 configs/qemu-riscv64_smode_defconfig

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