[FS#3539] ramips/mt7620 snapshot does not boot

[OpenWrt Bugs]

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FS#3539 - ramips/mt7620 snapshot does not boot
User who did this - Russell Senior (russell)

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Fwiw, /proc/mtd doesn't tell you the layout, it only tells you the mapping of partition number to name and size, not offset. You can get offset by looking in dmesg output not too long after boot. I typically pipe dmesg through grep 0x0 for something like this:

# dmesg | grep 0x0
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[    0.600627] 0x000000000000-0x000000030000 : "u-boot"
[    0.611598] 0x000000030000-0x000000040000 : "u-boot-env"
[    0.623275] 0x000000040000-0x000000050000 : "factory"
[    0.634397] 0x000000050000-0x000002000000 : "firmware"
[    0.670696] 0x000000000000-0x0000001dad67 : "kernel"
[    0.681597] 0x0000001dad67-0x000001fb0000 : "rootfs"
[    0.717737] 0x0000006a0000-0x000001fb0000 : "rootfs_data"


The kernel, rootfs and rootfs_data offsets are relative to the firmware partition, in this case.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3539#comment9238

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