[U-Boot] [PATCH v3 0/4] AE350 support SMP boot from flash

[Andes]

From: Rick Chen <rick at andestech.com>

In current RISC-V SMP flow, AE350 will encounter the the write
failure problem since hart_lottery and available_harts_lock was
not in ram address but in flash address when booing from flash.

This patch can help to fix the failure problem when AE350 was
booting from flash by disabling this two features.

Changes in v3:
- Modify CONFIG_XIP descriptions
- Use #ifdef CONFIG_OF_PRIOR_STAGE to replace #  if CONFIG_IS_ENABLED(OF_PRIOR_STAGE)
- Recovery some blank lines
- Add CONFIG_SF_DEFAULT_MODE=0x0 in ae350_rv32_xip_defconfig and ae350_rv64_xip_defconfig
- #ifdef CONFIG_OF_PRIOR_STAGE shall also surround SREG	s1, 0(t0)
- Modify CONFIG_SYS_FDT_BASE from 0x000f0000 as 0x800f0000 in ax25-ae350.h


Changes in v2:
- Fix some typos
- Also surround the declaration of prior_stage_fdt_address in arch/riscv/cpu/cpu.c with OF_PRIOR_STAGE
- Use CONFIP_XIP to replace CONFIG_HART_LOTTERY and CONFIG_AVAILABLE_HARTS

Rick Chen (4):
  riscv: Introduce CONFIG_XIP to support booting from flash
  riscv: configs: Support AE350 SMP booting from flash flow
  riscv: prior_stage_fdt_address should only be used when OF_PRIOR_STAGE
    is enabled
  riscv: configs: AE350 will use CONFIG_OF_PRIOR_STAGE when booting from
    ram

 arch/riscv/Kconfig                      |  7 ++++++
 arch/riscv/cpu/cpu.c                    |  4 ++++
 arch/riscv/cpu/start.S                  |  8 +++++++
 arch/riscv/include/asm/global_data.h    |  2 ++
 arch/riscv/lib/asm-offsets.c            |  2 ++
 arch/riscv/lib/smp.c                    |  2 ++
 board/AndesTech/ax25-ae350/ax25-ae350.c |  4 ----
 configs/ae350_rv32_defconfig            |  2 +-
 configs/ae350_rv32_xip_defconfig        | 37 ++++++++++++++++++++++++++++++++
 configs/ae350_rv64_defconfig            |  2 +-
 configs/ae350_rv64_xip_defconfig        | 38 +++++++++++++++++++++++++++++++++
 include/configs/ax25-ae350.h            |  2 +-
 12 files changed, 103 insertions(+), 7 deletions(-)
 create mode 100644 configs/ae350_rv32_xip_defconfig
 create mode 100644 configs/ae350_rv64_xip_defconfig

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2.7.4