Hi,

I have a MR3020 with 4MB flash that I want to upgrade to a 16MB. I also have a dominoPi with the SPI/JTAG cape that I would like to use as a programmer for my 16MB flash chip. I will use flashrom to program the SPI.

I have a question though, as all the procedures here are quite old. I have already upgraded the u-boot with pepe2k's modded one. I made a dump of all partitions: u-boot (mtd0) -128kb (which I suppose is the u-boot + data partition). The art partition and the firmware one.

What would be the proper way to create a 16MB flash image from here on?

Should I create an empty 16MB file and cat u-boot, firmware and art in it and then flash. Should I first compile an image for MR3020 that is 16MB in size and then cat u-boot, firmware and art in the empty file?

I'm a bit lost here, ao any help would be appreciated. I can alao try using the parallel connected flash chips with the CS jumper, but I don't feel that much comfortable doing that through u-boot and would prefer the SPI flashing through the programmer

(Last edited by ilf on 19 Jul 2016, 11:20)

What are partitions and their address on your 4Mbit flash? (e.g. mtd0 0x00000000, 0x00009000, mtd1....)

1. Prepare 16 MB empty bin file, filled with 0xFF.
2. Put:
- dump of the U-Boot image (128 KB) at offset 0x0
- OpenWrt/LEDE firmware (sysupgrade or factory, it doesn't matter) at offset 0x20000
- dump of ART (64 KB) in last sector (for 16 MB FLASH it will be at offset 0xFF0000)
3. Solder new FLASH chip on PCB.
4. Drink beer.

dev:    size   erasesize  name
mtd0: 00020000 00010000 "u-boot"
mtd1: 0014f194 00010000 "kernel"
mtd2: 00280e6c 00010000 "rootfs"
mtd3: 00090000 00010000 "rootfs_data"
mtd4: 00010000 00010000 "art"
mtd5: 003d0000 00010000 "firmware"

this is my current /proc/mtd

Also, thanks Pepe2K, both for the u-boot and the info. I'll try later today and will post status info.

Edit: can i just add the standart 4MB image, or should I compile a 16mb firmware, that I don't get

(Last edited by ilf on 19 Jul 2016, 15:04)