Based RFC v4 to fix:
- Change the patch order
- Add write operation to update pdin to fuse[] bit by bit
- Fix wrong protection for offset 0x0~0x38
- Add SIFIVE_U_OTP_PWE_EN definition
- Refine access macro for fuse[] and fuse_wo[]
Summary of Patches
- First patch is to add write opertion to update pdin data to fuse[] bit
by bit. Add 'write-once' feature to block second write to same bit of
the OTP memory.
- Second patch is to add file-backed implementation to allow users to use
'-drive' to assign an OTP raw image file. OTP image file must be bigger
than 16K.
For example, '-drive if=none,format=raw,file=otp.img'
Testing
- Tested on sifive_u for both qemu and u-boot.
Green Wan (2):
hw/riscv: sifive_u: Add write operation and write-once protection
hw/riscv: sifive_u: Add backend drive support
hw/riscv/sifive_u_otp.c | 80 ++++++++++++++++++++++++++++++++-
include/hw/riscv/sifive_u_otp.h | 5 +++
2 files changed, 84 insertions(+), 1 deletion(-)
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2.17.1
