Hello folks, I'm a little lost when trying to overwrite an ext partition on an eMMC memory inside of barebox. Your help finding the mistake is appreciated. My Setup: - Custom board with iMX6, 4GB eMMC and SD card reader (similar to Freescale SabreSD board) - Using PTXdist to build barebox 2016.05.0 and linux - The eMMC chip offers wear levelling, so I write a filesystem directly to it (using ptxdist created hd.img file flashed directly) - The eMMC is partitioned as follows: 0x0, Size 1k --> partition table 0x400, Size 8M --> barebox and barebox_env (offset 0x400 forced by iMX6) 0x800400, Size 1G --> ext filesystem with rootfs and kernel With this layout so far everything works fine. Now I would like to implement an update mechanism, where barebox erases the complete ext partition and replaces it. Under linux I would use something like dd and let it start at 0x800400. On barebox I have to use memcpy (thanks to Sascha for the hint http://lists.infradead.org/pipermail/barebox/2011-April/003308.html ) and this is where I get stuck. So I first add partitions so that the memory area is listed under /dev: devfs_add_partition("mmc3", 0x0, SZ_1K, DEVFS_PARTITION_FIXED, "mmc3.partable"); devfs_add_partition("mmc3", SZ_1K, SZ_8M, DEVFS_PARTITION_FIXED, "mmc3.barebox"); devfs_add_partition("mmc3", ( SZ_1K + SZ_8M ), SZ_1G, DEVFS_PARTITION_FIXED, "mmc3.rootfs"); This works for clearing the partitions data using memset: memset -d /dev/mmc3.rootfs 0x0 0x0 1073741824 However when I try to copy the root.ext2 filesystem onto this memory area, I can't mount the partition afterwards: memcpy -s /mnt/sd/root.ext2 -d /dev/mmc3.rootfs 0 536870912 mount /dev/mmc3.rootfs /mnt/mmc/ mount: No such file or directory I am questioning my approach, as I am not sure if it is correct to write an ext2 file directly to memory. Or am I making some other basic mistake here? Thanks for your help and cheers, Martin -- M.Eng. Martin Hollingsworth Medical Systems Engineering ITK Engineering AG Im Speyerer Tal 6 D-76761 Rülzheim Tel.: +49 7272 7703-510 Fax: +49 7272 7703-100 mailto:martin.hollingsworth@xxxxxxxxxxxxxxxxxx _____________________________________________________________ ITK Engineering AG Im Speyerer Tal 6 76761 Rülzheim Tel.: +49 7272 7703-0 Fax: +49 7272 7703-100 mailto:info@xxxxxxxxxxxxxxxxxx http://www.itk-engineering.de Vorsitzender des Aufsichtsrats/Chairman of the Supervisory Board: Josef Würth Vorstand/Executive Board: Michael Englert (Vorsitzender), Dr. Helmuth Stahl Sitz der Gesellschaft/Registered Office: 76773 Kuhardt/Pfalz Registergericht/Registered Court: Amtsgericht Landau, HRB 30139 USt.-ID-Nr./VAT-ID-No. DE813165046 _____________________________________________________________ _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
