[LEDE-DEV] [PATCH] ar71xx: fix flash fast read for flash chips > 16 MB

[Christian Beier]

Am Fri, 23 Feb 2018 09:40:54 +0100
schrieb Rafał Miłecki <zajec5 at gmail.com>:

> On 22 February 2018 at 20:13, Christian Beier <dontmind at freeshell.org> wrote:
> > From: Christian Beier <cb at shoutrlabs.com>
> >
> > SPI fast flash read only is supported on devices using 3-byte-addressing.
> > As chips bigger than 16MB use 4-byte-addressing, reading fails with
> > -EOPNOTSUPP.
> >
> > This commit sets the fast flash read callback spi->master->spi_flash_read
> > to NULL for chips that use 4-byte-addressing.
> >
> > Fixes https://bugs.openwrt.org/index.php?do=details&task_id=1376.
> >
> > Signed-off-by: Christian Beier <cb at shoutrlabs.com>  
> 
> Can you send this patch to the MTD mailing list, please?

The patch fixes/works around something added by OpenWRT, so the MTD mailing
list probably isn't the right place? I am referring to
https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/ar71xx/patches-4.9/461-spi-ath79-add-fast-flash-read.patch
which added in support for spi_flash_read() in the first place. That code is not
present in mainline Linux AFAICT.

> 
> Why adding it to the ar71xx target only?

Mainly because mentioned 461-spi-ath79-add-fast-flash-read.patch exists in the
ar71xx subdir.
 
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