[FS#3883] [NAND with badblocks] InitramFS image uses real partitions offset, w/o corrections to bad blocks

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - csharper2005 (csharper2005) 

Attached to Project - OpenWrt/LEDE Project
Summary - [NAND with badblocks] InitramFS image uses real partitions offset, w/o corrections to bad blocks
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details -  - Device problem occurs on - at least ramips NAND devices with bad erase blocks (Beeline Smartbox GIGA, Xiaomi Redmi router AC2100) 
 - Software versions - Trunk
 - Steps to reproduce (on a device with bad erase blocks, at 0x2c0000 in the following example):
1. Boot OpenWRT InitramFS (e.g. from TFTP);
2. Write something on a mtd* partition (after a badblock): 
 > mtd write kernel.bin /dev/mtd4
mtd4 offset - 0x400000
3. Check the written data using U-Boot or OpenWRT installed on NAND. Written data is shifted by (number of bad blocks)*(block size, 0x20000). Our data is actually written at 0x380000 (for U-Boot or OpenWRT installed on NAND). System doesn't boot if it was a kernel.

Device layout (dts file):
0x000000000000-0x000000100000: "Boot Loader"
0x000000100000-0x000000200000: "dynamic partition map"
0x000000200000-0x000000300000: "Factory"
0x000000300000-0x000000400000: "Boot Flag"
0x000000400000-0x000000a00000: "Kernel" mtd4
0x000000a00000-0x000001000000: "Kernel 2"
0x000001000000-0x000002800000: "File System 1"
0x000002800000-0x000004000000: "File System 2" 

Real partition addresses (for U-Boot, stock firmware & OpenWRT installed on NAND):
0x000000000000-0x000000100000 : "Boot Loader"
0x000000100000-0x000000200000 : "dynamic partition map"
0x000000200000-0x000000320000(shift by 1 block - 0x20000) : "Factory"
0x000000320000-0x000000420000(shift by 1 block - 0x20000): "Boot Flag"
0x000000420000-0x000000a20000(shift by 1 block - 0x20000): "Kernel" mtd4
0x000000a20000-0x000001020000(shift by 1 block - 0x20000): "Kernel 2"
0x000001020000-0x000002820000(shift by 1 block - 0x20000): "File System 1"
0x000002820000-0x000004020000(shift by 1 block - 0x20000): "File System 2"
   
Real partition addresses (for OpenWRT initramfs):
0x000000000000-0x000000100000 : "Boot Loader"
0x000000100000-0x000000200000 : "dynamic partition map"
0x000000200000-0x000000320000(shift by 1 block - 0x20000) : "Factory"
0x000000320000-0x000000420000(shift by 1 block - 0x20000): "Boot Flag"
0x000000420000-0x000000a20000(shift by 1 block - 0x20000): "Kernel 1"
0x000000a20000-0x000001020000(shift by 1 block - 0x20000): "Kernel 2"
0x000001020000-0x000002820000(shift by 1 block - 0x20000): "File System 1"
0x000002820000-0x000004020000(shift by 1 block - 0x20000): "File System 2"
 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3883

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