Hi Albert, On Mon, Jan 13, 2020 at 07:54:54AM +0000, Albert, Elmar wrote: > Hello everybody, > > I'm working on a customer board based on an iMX8MMini using Barebox > based on version 2019.05.0. We have problems to bring-up the USB with > type A connector, > we are not using type C as on the NXP EVK. > > I added the iMX8MMini to the drivers/usb/imx/imx-usb-misc.c completely > separated from the already implementation for the iMX7D. > > When starting an usb_rescan using the usb command, barebox crashes with > an exception. I updated the usb driver to version 2019.12.0, but get the > same behaviour, > it crashes with an exception: > > DABT (current EL) exception (ESR 0x96000061) at 0x000000005ff4005c The problem seems to be here that memset is called on non aligned memory that is allocated with dma_alloc_coherent(). On ARM64 we have memset implemented like this: void *memset(void *dst, int c, __kernel_size_t size) { if (likely(get_cr() & CR_M)) return __arch_memset(dst, c, size); return __default_memset(dst, c, size); } As you found out __arch_memset() crashes in your case. The test get_cr() & CR_M isn't quite correct here. We must test here how the page is mapped, not if the MMU is enabled. This test might be too expensive here, so that it's probably better to introduce and use memset_io here which doesn't try this optimization. Andrey, as you introduced this code, do you have any ideas to share what we want to do here? Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox