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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


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             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 ` MTD with non-power-of-2 page size Simon Aittamaa
2015-08-19 14:20 ` Sascha Hauer
2015-08-19 14:29   ` Dave Kitchen
2015-08-19 14:45     ` Sascha Hauer

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