From mboxrd@z Thu Jan 1 00:00:00 1970 From: Can Aydin Date: Tue, 28 Sep 2010 22:27:24 +1000 Subject: [U-Boot] [RFC] [PATCH 0/4] Add support for Freescale's 85xx and P1/P2xxx eSPI controller In-Reply-To: <4CA1D63E.3090102@locatacorp.com> References: <1281046488-25187-1-git-send-email-john.rigby@linaro.org> <1281046488-25187-2-git-send-email-john.rigby@linaro.org> <7751C735-9B47-496B-87A8-B8201F5FC562@kernel.crashing.org> <4CA1BBE0.4050209@locatacorp.com> <4CA1CB2E.2080501@emk-elektronik.de> <4CA1D63E.3090102@locatacorp.com> Message-ID: <4CA1DF2C.3010005@locatacorp.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de >> Can the Chip Select Pins be used as GPIO? It might be simpler to do >> that than >> adding a speciality to common code. > True, a GPIO pin could be re-purposed to serve as chip select, but that > would involve a soldering iron and a steady hand as the P1/P2xxRDB > boards are reference design boards sold by a lot of third party vendors > (including Denx if I'm not mistaken) this would detract from the ability > to just plug u-boot in and run with it. > > People could also choose to bitbang the SPI on their custom hardware but > again I feel that might defeat the purpose and spirit of u-boot. (Then > again, I'm new so don't quote me on that). > Quick followup, I may have misunderstood that question. The SPI pins can only be re-purposed as extra data pins for the SDHC. It's not possible to use them as GPIO.