On Tue, Mar 19, 2024 at 11:31:18PM +0100, Richard Weinberger wrote: > ----- Ursprüngliche Mail ----- > > Von: "Daniel Golle" <daniel@xxxxxxxxxxxxxx> > >> BTW: Is there a nice way to test this with nandsim in qemu? > >> I'd love being able to test all ubi attach code paths on my test setup. > > > > From what I can tell 'nandsim' doesn't have a way to be defined in > > Device Tree, making it unsuitable to test the attachment of UBI in > > this way. > > > > However, QEMU does support emulating TI OMAP's OneNAND controller, eg. > > as part of the Nokia N810 hardware supported by qemu-system-arm, see > > > > https://www.qemu.org/docs/master/system/arm/nseries.html > > > > So we could use that and modify the device tree in Linux to have a MTD > > partition for UBI and 'compatible = "linux,ubi";' set therein: > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/ti/omap/omap2420-n8x0-common.dtsi#n84 > > > > If you like I can prepare such a test setup. > > This would be great! > > > Is there a repository for MTD/UBI tests to be run on QEMU which I should > > contribute this to? > > UBI tests reside in the mtd-utils repository. > http://git.infradead.org/?p=mtd-utils.git;a=tree;f=tests/ubi-tests;h=20fd6a043eeb96a81736dd07885f74e4e0bb0cc0;hb=HEAD > > Maybe you can provide a small shell script which configures qemu? > It doesn't have to be fancy, just something David or I can use as staring point. I'm working on it but it turns out to be a bit more difficult than I thought it would be, because * the only devices with NAND flash emulated in QEMU or Nokia N800 and N810 as well as some even more ancient Intel PXA270 based PDA like the Sharp 'spitz'. * QEMU support for the N800 and N810 has apparently been bitrotting and is broken at least since 2019, nobody seems to care much. * The spitz predates device tree and hence is unsuitable for testing attachment of UBI via DT. But it at least boots because Guenter Roeck makes sure it does[1]. I was about to create a spitz-like imaginary board with DT, but also that doesn't seem to be completely trivial. So: hold my beer, I'll be back shortly ;) If anyone has better ideas on how to utilize support for raw NAND or the OneNAND controller in QEMU in a device-tree environment which actually works, that'd be great. Obviously I don't care about other peripherals like Bluetooth and all the complicated stuff of the N80x... [1]: https://github.com/groeck/linux-build-test/blob/master/rootfs/arm/run-qemu-arm.sh#L64
