archive mirror
 help / color / mirror / Atom feed
From: Alexander Sverdlin <>
To: Michael Walle <>
	Tudor Ambarus <>,
	Pratyush Yadav <>,
	Miquel Raynal <>,
	Richard Weinberger <>,
	Vignesh Raghavendra <>,
Subject: Re: [PATCH] mtd: spi-nor: mt25qu: Ignore 6th ID byte
Date: Tue, 23 Nov 2021 13:13:07 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Dear maintainers!

On 22/11/2021 16:05, Michael Walle wrote:
> Thanks, so that's the SFDP data for the mt25qu256aba8e12-1sit part. and the
> jedec id is 20bb19104473, correct?

While we are at this part, I've encountered another issue:

The chip supports 1-1-1, 1-1-4 and 1-4-4 write OPs in extended SPI mode,
while only 1-1-0 erase. (as well as 4-4-4/4-4-0, but that's not the issue here,
I think).

Now the erase code (chip/sector) uses spi_nor_spimem_setup_op(nor, &op, nor->write_proto)
in both functions.

In my opinion, as I look into Micron or Macronix datasheets, write_proto has little to
do with erase_proto. (there is currently no separate erase_proto)

Before I come up with a totally wrong patch, wanted to ask your opinion, how should
it be solved, what do you think?

I do not see any erase-related tables for this in JESD216C.
I also cannot come up with an example of a chip with erase != 1-1-0.

Shall I hardcode 1-1-0 for erase?
Shall I introduce erase_proto? What would be the logic for its setting/discovery?

Best regards,
Alexander Sverdlin.

Linux MTD discussion mailing list

  parent reply	other threads:[~2021-11-23 12:28 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-19  8:04 [PATCH] mtd: spi-nor: mt25qu: Ignore 6th ID byte Alexander A Sverdlin
2021-11-19 21:19 ` Michael Walle
2021-11-22  7:06   ` Alexander Sverdlin
2021-11-22 15:05     ` Michael Walle
2021-11-23  7:45       ` Alexander Sverdlin
2021-11-23  8:14         ` Michael Walle
2021-11-23 12:40           ` Alexander Sverdlin
2021-11-23 14:01             ` Michael Walle
2021-11-23 16:14               ` Tudor.Ambarus
2021-11-23 12:13       ` Alexander Sverdlin [this message]
2021-11-23 17:42         ` Pratyush Yadav
2021-11-25  7:26           ` Alexander Sverdlin
2021-11-30  9:49             ` Pratyush Yadav
2022-07-18 15:03 ` Tudor.Ambarus

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).