linux-kernel - [PATCH 1/2] mtd: spinand: Add support for 5-byte IDs

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

Message-ID: <20240125200108.24374-2-ezra@easyb.ch>
Date: Thu, 25 Jan 2024 22:01:07 +0200
From: Ezra Buehler <ezra@...yb.ch>
To: linux-mtd@...ts.infradead.org
Cc: Chuanhong Guo <gch981213@...il.com>,
	Dmitry Rokosov <ddrokosov@...rdevices.ru>,
	Martin Kurbanov <mmkurbanov@...rdevices.ru>,
	Md Sadre Alam <quic_mdalam@...cinc.com>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Sridharan S N <quic_sridsn@...cinc.com>,
	Vignesh Raghavendra <vigneshr@...com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] mtd: spinand: Add support for 5-byte IDs

From: Ezra Buehler <ezra.buehler@...qvarnagroup.com>

E.g. ESMT chips will return an identification code with a length of 5
bytes. In order to prevent ambiguity, flash chips would actually need to
return IDs that are up to 17 or more bytes long due to JEDEC's
continuation scheme. I understand that if a manufacturer ID is located
in bank N of JEDEC's database (there are currently 16 banks), N - 1
continuation codes (7Fh) need to be added to the identification code
(comprising of manufacturer ID and device ID). However, most flash chip
manufacturers don't seem to implement this (correctly).

Signed-off-by: Ezra Buehler <ezra.buehler@...qvarnagroup.com>
---
 include/linux/mtd/spinand.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index badb4c1ac079..5c19ead60499 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -169,7 +169,7 @@
 struct spinand_op;
 struct spinand_device;

-#define SPINAND_MAX_ID_LEN	4
+#define SPINAND_MAX_ID_LEN	5
 /*
  * For erase, write and read operation, we got the following timings :
  * tBERS (erase) 1ms to 4ms
-- 
2.43.0