Hello list, I posted an initial, quite horrible, patch to the forums to try and get the WNDR4300 working. I am not that experienced in either posting to lists or embedded development, so please do inform me of any mistakes I may have made.
> If that is the problem, swapping must be > enabled in the ar934x-nfc driver as well by an 'ath79_nfc_set_swap_dma(true)' > call before ath79_register_nfc(). See the mach-rb2011.c file [1] for example. That is good to know and probably quite quick to test (which is easy for me to say as I have not found the courage yet to solder a serial connection). > IMHO, the optimal solution would be the following: > > Add direct support to squashfs in order to be able to use that on top of plain > UBI volumes. Create two UBI volumes and use squashfs on the first and UBIFS on > the second volume. This would be much cleaner solution than the > 'ubi->gluebi->mtdblock->squashfs' combination. It would indeed be a cleaner solution, however I gather from [2] that performance differences are minimal. Furthermore, direct support for UBI-SquashFS is not in mainline, according to [5], and the latest proposed patch I could find went AWOL after someone gave comments [6]. Looking at the current layout [7], I think an initial solution would be to use mtd8 'rootfs' as single UBI volume and layering SquashFS on top via gluebi and mtdblock_ro. Of course, if the amount of work is comparable for direct versus gluebi, the direct scenario makes more sense. For the overlay, we could use the existing mtd12 'reserved' (for what, I wonder) as JFFS2 since that already includes bad block management. Using mtd12 would have the added advantage of providing a _huge_ amount of storage, while keeping the original layout of the flash, so it should be easy to revert to stock that way. > > One other thing which bothers me: U-Boot checks the rootfs CRC. If these > > FS are on the same UBI volume, doesn't get NAND pages of the whole MTD > > changed (wear leveling?) > > No AFAIK. The UBI layer only uses the erase sectors of a given UBI volume for > wear leveling. So _if_ one UBI volume was used this would be true, but since your proposal includes two UBI volumes, it works around the CRC check, right? Joris 1. https://dev.openwrt.org/browser/trunk/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c#L235 2. http://elinux.org/Flash_Filesystem_Benchmarks 3. http://lists.infradead.org/pipermail/linux-mtd/2013-February/045794.html 4. https://dev.openwrt.org/browser/trunk/target/linux/ar71xx/image/Makefile#L63 5. http://elinux.org/Flash_Filesystem_Benchmarks_Protocol#Tested_filesystems 6. https://lkml.org/lkml/2011/10/1/51 7. http://wiki.openwrt.org/toh/netgear/wndr4300#visual.representation _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
