mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Dave Kitchen <dave.kitchen@insync.tv>
To: barebox@lists.infradead.org
Subject: MTD with non-power-of-2 page size
Date: Wed, 12 Aug 2015 12:21:00 +0100	[thread overview]
Message-ID: <55CB2C1C.4000002@insync.tv> (raw)


I have just started to work with barebox on an Atmel at91sam9g45 processor.
The board has an Atmel AT45DB161 dataflash configured as 528-byte page size.
I find that eg saveenv command does not run as the page erase fails with 
EINVAL. On tracing this is fired from the page size and offset 
correction code [mtd/core,c mtd_erase_align()] which uses bit masking to 
align the size and offset. Unfortunately bit-masking does not work with 
non-power-of-2 pages. Has anyone else addressed this problem?

The 'trivial' exercise of replacing the bit masks by modulo [%] operator 
does not succeed as the compiler I am using (gcc!) does not support 
long-long divmod.

Regards
Dave Kitchen
InSync technology Ltd


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

             reply	other threads:[~2015-08-12 11:21 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-12 11:21 Dave Kitchen [this message]
2015-08-12 12:13 ` Simon Aittamaa
2015-08-19 14:20 ` Sascha Hauer
2015-08-19 14:29   ` Dave Kitchen
2015-08-19 14:45     ` Sascha Hauer

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:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

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

  git send-email \
    --in-reply-to=55CB2C1C.4000002@insync.tv \
    --to=dave.kitchen@insync.tv \
    --cc=barebox@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* 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