[PATCH 0/5] Convert Lichee Pi 4A to use S-Mode proper U-Boot

[Yao Zi]

RISC-V software usually expects that HARTs are running under S mode when
leaving the firmware, for example, the UEFI specification explicitly
states requirements for S mode.

This series separates M-mode-only code for TH1520 port out, and
configures binman to pack the OpenSBI firmware to initialize the S-mode
environment. Then S-mode proper U-Boot is enabled on our Lichee Pi 4A
port.

Note that booting on Lichee Pi 4A is broken between PATCH 3 and 4,
affecting bisectability. Considering TH1520 port is still in an early
stage and separating the changes make the commit cleaner, I personally
consider it's acceptable.

Yao Zi (5):
  riscv: cpu: th1520: Build spl.c for SPL only
  riscv: cpu: th1520: Support cache enabling/disabling in M mode only
  riscv: dts: th1520: Prepare binman configuration for loading OpenSBI
  board: thead: licheepi4a: Run proper U-Boot in S-Mode
  doc: thead: lpi4a: Update for S-Mode proper U-Boot support

 arch/riscv/cpu/th1520/Makefile          |   2 +-
 arch/riscv/cpu/th1520/cache.c           |   2 +
 arch/riscv/dts/thead-th1520-binman.dtsi |  32 +++++-
 configs/th1520_lpi4a_defconfig          |   1 +
 doc/board/thead/lpi4a.rst               | 125 +++++++-----------------
 5 files changed, 68 insertions(+), 94 deletions(-)

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2.49.0