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[RFC PATCH v2 0/2] Add write-once and file-backed features to OTP
From: |
Green Wan |
Subject: |
[RFC PATCH v2 0/2] Add write-once and file-backed features to OTP |
Date: |
Fri, 31 Jul 2020 10:47:06 +0800 |
First patch is to add file-backed implementation to allow users to assign
an OTP image file to machine. Users can assign the property, "otp-file",
to machine to enable it. File-backed feature is set to "NULL" string in
default. Any filename other than "NULL" is used as OTP image file.
For example, '-M sifive_u,otp-file="otp.img"'
To keep data up-to-date due to an unexpected crash or CTRL+a-x exit, every
read/write command to OTP memory involves file open, mmap and close
operation to the image file.
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 file-backed OTP.
hw/riscv: sifive_u: Add write-once protection.
hw/riscv/sifive_u.c | 26 ++++++++
hw/riscv/sifive_u_otp.c | 103 ++++++++++++++++++++++++++++++++
include/hw/riscv/sifive_u.h | 2 +
include/hw/riscv/sifive_u_otp.h | 2 +
4 files changed, 133 insertions(+)
--
2.17.1
- [RFC PATCH v2 0/2] Add write-once and file-backed features to OTP,
Green Wan <=