Hello Stefano, On 15.11.24 14:43, Stefano Manni wrote: > Dear all, > > I cannot run an ELF image on the M7 core on the imx8mp soc. > The ELF comes from zephyr and it runs as expected when I load it from linux, > but in barebox I encounter this error: > > barebox@NXP i.MX8MPlus EVK board:/ tftp zephyr.elf > [################################################################] > barebox@NXP i.MX8MPlus EVK board:/ firmwareload zephyr.elf > remoteproc0: powering up remoteproc-cm7.of > DABT (current EL) exception (ESR 0x96000061) at 0x00000000007e0004 https://esr.arm64.dev/#0x96000061 decodes this as "Abort caused by writing to memory" (Alignment fault) with valid FAR. FAR is the addresss listed here (0x00000000007e0004), which is indeed not divisible by 8. > [<ffd826f4>] (__arch_memcpy+0x48/0x13c) from [<ffd82a00>] (memcpy+0xc/0x14) The optimized memcpy used here expects misalignment not to trap. > As you can see the exception happens when rproc_elf_load_segments() tries to > memcpy a segment where the M7 expects it. The ELF has been compiled to run > from ITCM memory (0x007E0000-0x007FFFFF). > > Do you have any idea? Maybe may I have to put a reserved-memory for ITCM? I think I may have broken this when I changed barebox to map everything outside main memory as uncached. I did this, because we 1) don't want to risk the main CPU speculating into I/O memory and 2) don't want to have to use memory barriers for synchronization. The flipside is that drivers that access I/O memory must do this via readl/writel and friends or via memcpy_io/memset_io. This was already required before, but some drivers that didn't do this were lucky enough to fly under the radar. At least for remoteproc, this seems no longer the case. I just Cc'd you on a patch to fix this for remoteproc. Please let me know with a Tested-by if this resolves your issue. Cheers, Ahmad > > Thank you. > > Best, > Stefano > > -- 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 |
