linux-kernel - [PATCH v4 0/3] add support for is25wp256 spi-nor device.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1557569288-19441-1-git-send-email-sagar.kadam@sifive.com>
Date:   Sat, 11 May 2019 15:38:05 +0530
From:   Sagar Shrikant Kadam <sagar.kadam@...ive.com>
To:     marek.vasut@...il.com, tudor.ambarus@...rochip.com,
        dwmw2@...radead.org, computersforpeace@...il.com,
        bbrezillon@...nel.org, richard@....at, palmer@...ive.com,
        aou@...s.berkeley.edu, paul.walmsley@...ive.com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Cc:     Sagar Shrikant Kadam <sagar.kadam@...ive.com>
Subject: [PATCH v4 0/3] add support for is25wp256 spi-nor device.

The patch set is tested on HiFive Unleashed board and is based on mainline
kernel v5.1. Its intended to add support for 32 MB spi-nor flash
mounted on the board. Memory Device supports 4/32/and 64 KB sectors size.
The device id table is updated accordingly.

Flash parameter table for ISSI device is set to use macronix_quad_enable
procedure to set the QE (quad-enable) bit of Status register.

A unilaterlay block unlocking scheme is added in patch 2.

These patches are based on original work done by Wesley Terpstra and/or Palmer Dabbelt:
https://github.com/riscv/riscv-linux/commit/c94e267766d62bc9a669611c3d0c8ed5ea26569b

Erase/Read/Write operations are verified on HiFive Unleashed board using  mtd and flash utils (v1.5.2):
1. mtd_debug  	:Options available are : erase/read/write.
2. flashcp	:Single utility that erases flash, writes a file to flash and verifies the data back.
3. flash_unlock: Unlock flash memory blocks.Arguments: are offset and number of blocks.
3. flash_lock: 	 Lock flash memory blocks. Arguments: are offset and number of blocks. 

Unlock scheme clears the protection bits of all blocks in the Status register.

Lock scheme:
A basic implementation based on stm_lock scheme and is validated for different number of blocks passed
to flash_lock. ISSI devices have Top/Bottom area selection in "function register" which is OTP memory.

Revision history:
V3<->V4:
-Extracted comman code and renamed few stm functions so that it can be reused for issi lock implementation.
-Added function's to read and write FR register, for selecting Top/Bottom area.

V2<->V3:
-Rebased patch to mainline v5.1 from earlier v5.1-rc5
-Updated commit messages, and cover letter with reference to git URL and author information.
-Deferred flash_lock mechanism and can go as separate patch. 

V1<-> V2:
-Incorporated changes suggested by reviewers regarding patch/cover letter versioning, references of patch.
-Updated cover letter with description for flash operations verified with these changes.
-Add support for unlocking is25xxxxxx device
-Add support for locking is25xxxxxx device.

v1:
-Add support for is25wp256 device.

Sagar Shrikant Kadam (3):
  mtd: spi-nor: add support for is25wp256
  mtd: spi-nor: add support to unlock flash device.
  mtd: spi-nor: add locking support for is25xxxxx device

 drivers/mtd/spi-nor/spi-nor.c | 345 +++++++++++++++++++++++++++++++++++-------
 include/linux/mtd/spi-nor.h   |   7 +
 2 files changed, 301 insertions(+), 51 deletions(-)

-- 
1.9.1