From mboxrd@z Thu Jan 1 00:00:00 1970 From: andy@warmcat.com (Andy Green) Date: Tue, 22 Sep 2009 15:10:00 +0100 Subject: SPI, DMA and an i.MX31 In-Reply-To: <87077C4F48609F4392621D9F99DDE20901202E03@tesla.star.galaxy.io> References: <87077C4F48609F4392621D9F99DDE20901202DFF@tesla.star.galaxy.io> <87077C4F48609F4392621D9F99DDE20901202E00@tesla.star.galaxy.io> <4AB7C020.2070205@gmail.com><4AB839FF.4000803@windriver.com><87077C4F48609F4392621D9F99DDE20901202E02@tesla.star.galaxy.io> <4AB8C1A4.4020403@warmcat.com> <87077C4F48609F4392621D9F99DDE20901202E03@tesla.star.galaxy.io> Message-ID: <4AB8DAB8.801@warmcat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 09/22/09 14:22, Somebody in the thread at some point said: Hi Rene - > After changing that my system booted smoothly. If I look in '/proc' there > is a dir called 'sdma', and inside there is a file 'channels': > $ cat channels > Channel 0: MCU > > It seams to be alive :-) > >> Take a look at ./drivers/mmc/host/mxcmmc.c > > Next will try to test the mmc driver, but I don't have an MMC/SD slot on > my board. Hopefully there is some sign of an MMC in the channels > file or so. Sounds encouraging... if you want to post or send a test patch if it gets to that point I'll try to give it a go on a real SD Card. At the moment event/0 which owns the PIO to the SD card eats most of the CPU on a loaded system, this should be pretty revolutionary when it works. -Andy