On Fri, Aug 14, 2015 at 08:08:13PM +0200, Bartlomiej Zolnierkiewicz wrote: > On Friday, August 14, 2015 06:43:30 PM Russell King - ARM Linux wrote: > > On Fri, Aug 14, 2015 at 07:04:23PM +0200, Bartlomiej Zolnierkiewicz wrote: > > > This patch disables deprecated IDE subsystem in footbridge_defconfig > > > (no IDE host drivers are selected in this config so there is no valid > > > reason to enable IDE subsystem itself). > > > > That's actually incorrect. I use IDE on Footbridge because it works > > loads with my CY82C693 board. I never submitted the patches which make > > CY82C693 work on ARM though... > > > > However, the CY82C693 must not be allowed to use DMA (which is why the > > ATA driver can't be used) - if it does, it locks the PCI bus. It's > > a hardware incompatibility between some PCI devices and the Footbridge. > > PATA driver is the same in this regard as IDE one. They both try to > use DMA if supported by a device. Would be great if you could fix > them (or at least PATA one) to limit your setup to PIO automatically > (please also note that you can limit libata to PIO manually these > days). > > When it comes to CY82C693 there is also a leftover issue with PATA > driver that it only supports primary interface currently (BTW this is > why I left Alpha's defconfig alone for now - it uses CY82C693). I can > look into fixing this (or assist in this work) if you are interested > in it. Well, it looks like the PCI layer has been screwed for this for some time: cy82c693 0000:00:06.1: IDE controller (0x1080:0xc693 rev 0x00) Cypress_IDE 0000:00:06.1: device not available (can't reserve [io 0x0170-0x0177]) Cypress_IDE 0000:00:06.1: device not available (can't reserve [io 0x0170-0x0177]) cy82c693 0000:00:06.1: couldn't enable device Cypress_IDE: probe of 0000:00:06.1 failed with error -22 The PCI layer forces the standard legacy ports onto the Cypress device, and then the "primary" resources get null'd out by the long-standing CY82C693 quirk in the ARM bios32.c. However - the ARM quick is not what causes the above - the above looks to be caused by the generic PCI code going wrong - it adds those legacy resources, and nothing ever connects them to the resource tree: 000000a0-000000bf : pic2 000000c0-000000df : dma2 00000213-00000213 : ISAPnP 000002f8-000002ff : serial8250.0 which then causes pci_enable_device() to fail. I doubt CY82C693 even works on Alpha... or any IDE interface using the legacy IO ports... So it may take quite a bit of work to get going again - not something I'm going to attempt prior to the 4.3 merge window. -- FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
