From mboxrd@z Thu Jan 1 00:00:00 1970 From: khilman@baylibre.com (Kevin Hilman) Date: Tue, 17 Jan 2017 16:25:23 -0800 Subject: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash In-Reply-To: <20170117125742.9536-1-fparent@baylibre.com> (Fabien Parent's message of "Tue, 17 Jan 2017 13:57:42 +0100") References: <20170117125742.9536-1-fparent@baylibre.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Fabien Parent writes: > Read access to the SPI flash are broken on da850-evm, i.e. the data > read is not what is actually programmed on the flash. > According to the datasheet for the M25P64 part present on the da850-evm, > if the SPI frequency is higher than 20MHz then the READ command is not > usable anymore and only the FAST_READ command can be used to read data. > > This commit specifies in the DTS that we should use FAST_READ command > instead of the READ command. > > Signed-off-by: Fabien Parent Tested on da850-evm on top of v4.10-rc3. This gets the DT boot functionatliy in line with the legacy (board-file) boot. Tested-by: Kevin Hilman Kevin From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Hilman Subject: Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash Date: Tue, 17 Jan 2017 16:25:23 -0800 Message-ID: References: <20170117125742.9536-1-fparent@baylibre.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <20170117125742.9536-1-fparent-rdvid1DuHRBWk0Htik3J/w@public.gmane.org> (Fabien Parent's message of "Tue, 17 Jan 2017 13:57:42 +0100") Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Fabien Parent Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, nsekhar-l0cyMroinI0@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org List-Id: devicetree@vger.kernel.org Fabien Parent writes: > Read access to the SPI flash are broken on da850-evm, i.e. the data > read is not what is actually programmed on the flash. > According to the datasheet for the M25P64 part present on the da850-evm, > if the SPI frequency is higher than 20MHz then the READ command is not > usable anymore and only the FAST_READ command can be used to read data. > > This commit specifies in the DTS that we should use FAST_READ command > instead of the READ command. > > Signed-off-by: Fabien Parent Tested on da850-evm on top of v4.10-rc3. This gets the DT boot functionatliy in line with the legacy (board-file) boot. Tested-by: Kevin Hilman Kevin -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752682AbdARAZ1 (ORCPT ); Tue, 17 Jan 2017 19:25:27 -0500 Received: from mail-pg0-f47.google.com ([74.125.83.47]:33232 "EHLO mail-pg0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752543AbdARAZZ (ORCPT ); Tue, 17 Jan 2017 19:25:25 -0500 From: Kevin Hilman To: Fabien Parent Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, nsekhar@ti.com, robh+dt@kernel.org, mark.rutland@arm.com Subject: Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash Organization: BayLibre References: <20170117125742.9536-1-fparent@baylibre.com> Date: Tue, 17 Jan 2017 16:25:23 -0800 In-Reply-To: <20170117125742.9536-1-fparent@baylibre.com> (Fabien Parent's message of "Tue, 17 Jan 2017 13:57:42 +0100") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (darwin) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fabien Parent writes: > Read access to the SPI flash are broken on da850-evm, i.e. the data > read is not what is actually programmed on the flash. > According to the datasheet for the M25P64 part present on the da850-evm, > if the SPI frequency is higher than 20MHz then the READ command is not > usable anymore and only the FAST_READ command can be used to read data. > > This commit specifies in the DTS that we should use FAST_READ command > instead of the READ command. > > Signed-off-by: Fabien Parent Tested on da850-evm on top of v4.10-rc3. This gets the DT boot functionatliy in line with the legacy (board-file) boot. Tested-by: Kevin Hilman Kevin