First 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' Second patch is to add 'write-once' feature to block second write to the OTP memory. Only keep the 'written' state for non-control register range from 0x38 to 16KB. Tested on sifive_u for both qemu and u-boot. Green Wan (2): hw/riscv: sifive_u: Add backend drive support hw/riscv: sifive_u: Add write-once protection. hw/riscv/sifive_u_otp.c | 71 +++++++++++++++++++++++++++++++++ include/hw/riscv/sifive_u_otp.h | 3 ++ 2 files changed, 74 insertions(+) -- 2.17.1
