[FS#3471] Mikrotik RB911-5Hn propper nand detection failed

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FS#3471 - Mikrotik RB911-5Hn propper nand detection failed
User who did this - rogerpueyo (rogerpueyo)

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Hi Alexandros,

Thanks for testing that.

MikroTik devices with NAND flash also have a tiny NOR flash where the bootloader, the calibration data and the device information are stored.

For example, my SXTLite5 has a 128 kbytes NOR flash chip:

[    0.594784] spi-nor spi0.0: w25x10 (128 Kbytes)
[    0.599528] 1 fixed-partitions partitions found on MTD device spi0.0
[    0.606109] Creating 1 MTD partitions on "spi0.0":
[    0.611096] 0x000000000000-0x000000020000 : "RouterBoot"
[    0.619637] 5 routerbootpart partitions found on MTD device RouterBoot
[    0.626447] Creating 5 MTD partitions on "RouterBoot":
[    0.631791] 0x000000000000-0x00000000c000 : "bootloader1"
[    0.638514] 0x00000000c000-0x00000000d000 : "hard_config"
[    0.645267] 0x00000000d000-0x00000000e000 : "bios"
[    0.651435] 0x00000000e000-0x00000000f000 : "soft_config"
[    0.658220] 0x000000010000-0x000000020000 : "bootloader2"


but your NAND-RB911Lite5 has (surprise!) a 64 kbytes chip:

[    4.534025] spi-nor spi0.0: mx25l512e (64 Kbytes)
[    4.538906] 1 fixed-partitions partitions found on MTD device spi0.0
[    4.545368] Creating 1 MTD partitions on "spi0.0":
[    4.550250] 0x000000000000-0x000000020000 : "RouterBoot"
[    4.555650] mtd: partition "RouterBoot" extends beyond the end of device "spi0.0" -- size truncated to 0x10000
[    4.568564] RouterBoot: routerboot partition /ahb/spi at 1f000000/flash at 0/partitions/partition at 0/partition at 10000 (/ahb/spi at 1f000000/flash at 0/partitions/partition at 0) "bootloader2" extends past end of segment.
[    4.586958] RouterBoot: error parsing routerboot partition /ahb/spi at 1f000000/flash at 0/partitions/partition at 0/partition at 10000 (/ahb/spi at 1f000000/flash at 0/partitions/partition at 0)
[    4.602778] 2 fixed-partitions partitions found on MTD device RouterBoot
[    4.609582] Creating 2 MTD partitions on "RouterBoot":
[    4.614816] 0x000000000000-0x000000010000 : "bootloader1"
[    4.621413] 0x000000010000-0x000000020000 : "bootloader2"
[    4.626971] mtd: partition "bootloader2" is out of reach -- disabled


This is why there's nothing at /sys/firmware/mikrotik, because the partitions layout is different and the driver can not get the right calibration data.

I've compiled an **ath79** image for your NAND-RB911Lite5 based on the SXTLite5, which is available here. I wonder if you could give it a try. Specifically, could you tell me what is in the /proc/mtd file (or just paste the dmesg output, as you want)?

Please find the new images here: https://we.tl/t-hb7qbpHX9n

Cheers!
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3471#comment9047

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