Ulrich, The ide-patch i took is from ftp://ftp.buici.com/pub/arm/patch-linux-2.6.11/ Is that good enough? Alan was referring to PIO mode in that thread but this implementation doesnt have IO mode and also no IDE support. It only has memory mode and I will have to support it as memory. How do I do that? Another question: If I rework the board so that the wires coming to MEMR and MEMW are rewired to IOR and IOW respectively, does it work in TrueIDE mode? Just a thought! Thanks, Kiran -----Original Message----- From: linux-mips-bounce@xxxxxxxxxxxxxx [mailto:linux-mips-bounce@xxxxxxxxxxxxxx]On Behalf Of Ulrich Eckhardt Sent: Friday, May 06, 2005 12:14 AM To: linux-mips@xxxxxxxxxxxxxx Subject: Re: CF custom implementation Kiran Thota wrote: > I am working on a MIPS-based processor SoC which has a custom CF > implementation over Local Bus. The CF doesnt support IO mode, interrupts, > 32-bit support. > It has limited register support [no interface registers to reset the CF]. I > am using 2.6.10 from linux-mips. I have already written a PCMCIA/CF socket > socket for the same. > The goal is to use the CF cards as memoy devices. Advise me on the path to > take: > > PCMCIA/CF ->CS/DS -> IDE [I found a patch to make IDE work in polled mode] Could you tell me where you found that patch? > I am currently using Lexar and Hitachi Compact Flash cards. CF is a standard, so this shouldn't matter. > The CIS can be read and when the Linux boots up and I invoke cardmgr > [v3.2.8], it sees the device as ATA/IDE Fixed Disk [Func = 4 (Fixed Disk) ] > Is there a way to force it to come up in memory only mode? Please suggest. I'm using a CF card attached to the PCMCIA interface of an Alchemy Au1100. Since my board only has a CF slot, I'm not using the whole PCMCIA stack at all - CONFIG_PCMCIA=no and no cardmgr. All I do is detect the card, parse the CIS and register the CF card with the IDE/ATA system of the kernel, just like Alan Cox suggested in the recent thread "ATA devices attached to arbitary busses". One good reason for me doing so is that I need to mount the root filesystem from the CF but the PCMCIA stack requires user-space helpers. Uli
