#1 is so unreadable that i had to translate it :D
(Formatting post in progress)
• Compile guide
∘ Create new user for it - because you will run binaries from unknown source :D
∘ Download this half gig tarball, includes toolchain
http://www.tp-link.com/resources/GPL/mr … 0v1.tar.gz
∘ Apply patch below to file mr3420_3220v1/ap99/boot/u-boot/include/configs/ap99.h
https://gist.github.com/swiftgeek/6128eb9a6c9ad26f9fdf
Edit it to your needs afterwards (eg. for 8MiB flash change #define FLASH_SIZE)
∘ Look into ar7240.h for device/setup specific changes (prompt, autoboot)
∘ cd to mr3420_3220v1/build
∘ mv Makefile Makefile.bak
∘ mv Makefile.ap99 Makefile
∘ make BOARD_TYPE=ap99 uboot
∘ Image will appear in mr3420_3220v1/images/ap99/
∘ Additional cosmetic changes:
∘ Compile in the future ! (set date to future so compilation timestamp will show future time)
• Dump guide
∘ In case of tplinks save u-boot and art partitions, cat /proc/mtd
dev: size erasesize name
mtd0: 00020000 00010000 "u-boot"
mtd1: 00110600 00010000 "kernel"
mtd2: 002bfa00 00010000 "rootfs"
mtd3: 000a0000 00010000 "rootfs_data"
mtd4: 00010000 00010000 "art"
mtd5: 003d0000 00010000 "firmware"
∘ cat /dev/mtd0 > u-boot_orig.img
∘ cat /dev/mtd4 > art_orig.img
∘ check sizes with du (128KiB, 64KiB)
• Merge guide
∘ Since generated uboot image isn't round 131072 bytes - but has to be not bigger than 127KiB (do not attempt to continue if bigger) - append 0xFF to the end of space dedicated for binary (or instead of using dump, type in values manually like in post #1)
Read about notrunc
∘ First remove original u-boot (0xFF it!)
dd if=/dev/zero bs=127K count=1 | tr '\000' '\377' | dd of=u-boot_16MiB.img conv=notrunc
∘ Then insert new u-boot (the binary that you have compiled, from mr3420_3220v1/images/ap99/)
dd if=u-boot_16MiB.bin of=u-boot_16MiB.img conv=notrunc
∘ Make sure that model/mac/pin prevailed!
∘ vim :%!xxd
• Flash guide
∘ flashrom layout preparation
∘ grep mtd name (like art) from dmesg
[ 0.840000] 0x0000003f0000-0x000000400000 : "art"
∘ Or even grep like this:
# dmesg | grep \" | grep 0x
[ 0.770000] 0x000000000000-0x000000020000 : "u-boot"
[ 0.780000] 0x000000020000-0x000000130600 : "kernel"
[ 0.800000] 0x000000130600-0x0000003f0000 : "rootfs"
[ 0.830000] 0x000000350000-0x0000003f0000 : "rootfs_data"
[ 0.840000] 0x0000003f0000-0x000000400000 : "art"
[ 0.840000] 0x000000020000-0x0000003f0000 : "firmware"
Basically copy and paste starting points of partitions and "calculate" (size of dumps in bytes in hex -1 + starting point) endings as both addresses are included
• For 4MiB (because why would you want more with programmer being so slow?), save as file eg. TODO
00000000:0001ffff u-boot
0003f000:0003fffff art
• For 16MiB
00000000:0001ffff u-boot
00ff0000:00ffffff art
∘ arduino serprog as example programmer for everyone
∘ http://flashrom.org/Serprog/Arduino_flasher
∘ Prepare image of whole flash (even if you are only flashing one partitiion)
dd if=/dev/zero bs=16777216 count=1 | tr '\000' '\377' | dd of=total.img conv=notrunc
dd if=./u-boot_16MiB.img of=total.img conv=notrunc
dd if=./art_orig.img of=total.img conv=notrunc obs=16320k seek=1
∘ Either use buffers to get right voltage levels or power whole duino board from 3v3 (like eg. nanino) and connect flash directly
flashrom -p serprog:dev=/dev/ttyUSB0:2000000 -l nor-16MiB.layout -i art -i u-boot -w total.img
∘ the rest from uboot tftp method (or if something goes wrong and u-boot still woks)
∘ tftpgui is fastest to run/setup on linux desktop, but do not forget about disabling firewall/adding rules in firewall for it
∘ https://github.com/pepe2k/u-boot_mod#us … ftp-server
• Only typing "tpl" string is needed - no need for pressing enter after it to break from autoboot
• Mind correct offsets and sizes (eg. 3420v1 bootloader + config has 128KiB - 0x2000). Size is provided as result of tftpboot command. U-boot offsets are using ¿physical address space - not address space of mtd device!
• Go first with tftpboot to get line:
"Bytes transferred = 3932160 (3c0000 hex)"
just for double checking size for flash/erase
∘ Other ways than uboot¿?
∘ kermit is too slow (theretical max of ?14KiB/s)
http://blackfin.uclinux.org/doku.php?id … ding_files
Varia:
ART partition can differ (very) slightly from board to board - same hwrev! (at least on hwrev1.2 of mr3420)
Autoboot with escape (ar7240.h)
#define CONFIG_AUTOBOOT_STOP_STR "\x1b"
#define CONFIG_AUTOBOOT_PROMPT "Hit ESC key to stop autoboot: %d\n"
u-boot mod is not explicitly needed as long as you copy art partition properly - it will boot stock images just fine. You just won't be able to access anything past 4MiB from u-boot
(Last edited by swiftgeek on 19 Mar 2015, 08:48)
