Hi All, We've had a successful port of OpenWRT to the rb751 for some time but a recent batch of new boards refuse to take our pxeboot image after erasing the kernel and rootfs mtd partitions. Upon examination of the boards, it appears that MikroTik has moved from an 8Mb flash to a 16Mb flash. (Hooray!) These boards can be identified by a longer MMCX connector out the back of the case, (making an L MMCX connector usable ) and a mac address starting with D4:CA.....
What we see happening is that when our PXEboot image loads, we see a kernel mtd1 partition as 3.8M in size, (as before) but when we unlock it, and format it, we see 768K "used" after mount. However, nothing is in the mounted directory. The main difference we see in dmesg between the old rb751s and the newer rb751s is this: Old Boards: [ 1.130000] NAND flash driver for the RouterBOARD 750 version 0.1.0 [ 1.200000] NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit) [ 1.300000] Scanning device for bad blocks [ 1.650000] Creating 3 MTD partitions on "NAND 64MiB 3,3V 8-bit": [ 1.720000] 0x000000000000-0x000000040000 : "booter" [ 1.790000] 0x000000040000-0x000000400000 : "kernel" [ 1.850000] 0x000000400000-0x000004000000 : "rootfs" [ 1.910000] mtd: partition "rootfs" set to be root filesystem [ 1.980000] mtd: partition "rootfs_data" created automatically, ofs=98C000, len=3674000 [ 2.080000] 0x00000098c000-0x000004000000 : "rootfs_data" New Boards: [ 1.010000] NAND flash driver for the RouterBOARD 750 version 0.1.0 [ 1.020000] NAND device: Manufacturer ID: 0xec, Chip ID: 0xf1 (Samsung NAND 128MiB 3,3V 8-bit) [ 1.030000] Scanning device for bad blocks [ 1.090000] Bad eraseblock 687 at 0x0000055e0000 [ 1.130000] Creating 3 MTD partitions on "NAND 128MiB 3,3V 8-bit": [ 1.130000] 0x000000000000-0x000000040000 : "booter" [ 1.140000] 0x000000040000-0x000000400000 : "kernel" [ 1.150000] 0x000000400000-0x000008000000 : "rootfs" [ 1.150000] mtd: partition "rootfs" set to be root filesystem root@OpenWrt:/etc/init.d# mount -t yaffs2 /dev/mtdblock1 /mnt/kernel root@OpenWrt:/etc/init.d# df -h Filesystem Size Used Available Use% Mounted on tmpfs 14.4M 60.0K 14.3M 0% /tmp tmpfs 512.0K 0 512.0K 0% /dev /dev/mtdblock1 3.8M 768.0K 3.0M 20% /mnt/kernel A du shows that there is no data other than the bare directories root@OpenWrt:/mnt# du -h * 2.0K kernel/lost+found 4.0K kernel Running some diagnostics reveals that the partition is the size we expect. root@OpenWrt:/etc/init.d# mtdinfo /dev/mtd1 mtd1 Name: kernel Type: nand Eraseblock size: 131072 bytes, 128.0 KiB Amount of eraseblocks: 30 (3932160 bytes, 3.8 MiB) Minimum input/output unit size: 2048 bytes Sub-page size: 512 bytes OOB size: 64 bytes Character device major/minor: 90:2 Bad blocks are allowed: true Device is writable: true Erasing seems to be fine. root@OpenWrt:/usr/sbin# ./flash_erase /dev/mtd1 0 0 Erasing 128 Kibyte @ 3a0000 -- 100 % complete But formatting fails: root@OpenWrt:/usr/sbin# ftl_format /dev/mtd1 Partition size = 3840 kb, erase unit size = 128 kb, 1 transfer units Reserved 5%, formatted size = 3572224 bytes Erasing all blocks... -------+-------+-------+------ Writing erase unit headers... write failed: Invalid argument format failed. So where should we make changes to support the new NAND flash, to get the 3.8M back like the old version of flash, on our pxeboot image, and ultimately, our kernel and rootfs that we replace RouterOS with? Any ideas would be greatly appreciated. Thanks!
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