From: Marek Vasut <marek.vasut@gmail.com>
To: "Cédric Le Goater" <clg@kaod.org>, linux-mtd@lists.infradead.org
Cc: Cyrille Pitchen <cyrille.pitchen@atmel.com>,
Boris Brezillon <boris.brezillon@free-electrons.com>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Richard Weinberger <richard@nod.at>
Subject: Re: [PATCH 3/4] mtd: spi-nor: aspeed: configure chip window on AHB bus
Date: Thu, 20 Apr 2017 15:30:41 +0200 [thread overview]
Message-ID: <1ef778ad-30e1-d80a-aaf9-e987c9e23fed@gmail.com> (raw)
In-Reply-To: <1492689397-4704-4-git-send-email-clg@kaod.org>
On 04/20/2017 01:56 PM, Cédric Le Goater wrote:
> The segment registers of the SMC controller provide a way to configure
> the mapping windows of the chips on the AHB bus. The settings are
> required to be correct when the controller operates in Command mode,
> which is the case for DMAs and the LPC mapping.
>
> This tries to set the segment registers of each chip depending on the
> size of the flash device and depending on the previous segment
> settings, in order to have a contiguous window across multiple chips.
>
> Unfortunately, the AST2500 SPI controller has a bug and it is not
> possible to configure a full 128MB window for a chip of the same
> size. The window size needs to be restricted to 120MB. This issue only
> applies to CE0.
>
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
--
Best regards,
Marek Vasut
next prev parent reply other threads:[~2017-04-20 13:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 11:56 [PATCH 0/4] mtd: spi-nor: aspeed: add dual read and command mode support Cédric Le Goater
2017-04-20 11:56 ` [PATCH 1/4] mtd: spi-nor: aspeed: remove dummies from keep mask Cédric Le Goater
2017-04-20 13:28 ` Marek Vasut
2017-06-20 22:25 ` Cyrille Pitchen
2017-04-20 11:56 ` [PATCH 2/4] mtd: spi-nor: aspeed: add support for SPI dual IO read mode Cédric Le Goater
2017-04-20 13:28 ` Marek Vasut
2017-06-20 22:50 ` Cyrille Pitchen
2017-06-21 7:32 ` Cédric Le Goater
2017-06-21 12:25 ` Cédric Le Goater
2017-06-21 22:46 ` Cyrille Pitchen
2017-04-20 11:56 ` [PATCH 3/4] mtd: spi-nor: aspeed: configure chip window on AHB bus Cédric Le Goater
2017-04-20 13:30 ` Marek Vasut [this message]
2017-06-20 22:34 ` Cyrille Pitchen
2017-04-20 11:56 ` [PATCH 4/4] mtd: spi-nor: aspeed: use command mode for reads Cédric Le Goater
2017-04-20 13:31 ` Marek Vasut
2017-04-20 13:33 ` Richard Weinberger
2017-04-20 13:53 ` Cédric Le Goater
2017-04-20 13:58 ` Marek Vasut
2017-06-20 7:10 ` Cédric Le Goater
2017-06-20 9:07 ` Cédric Le Goater
[not found] ` <2bd0b105-7652-8917-4a1d-6f218eaf848e@atmel.com>
2017-06-20 13:49 ` Cédric Le Goater
2017-06-20 14:06 ` Cédric Le Goater
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