[RFC PATCH v3 0/2] Add file-backed and write-once features to OTP

[Green Wan]

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(+)

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2.17.1