Hi JPT,
On Wed, 03 Apr 2013 13:30:46 +0200, JPT j-p-t@gmx.net wrote:
hi,
Am 03.04.2013 11:00, schrieb Albert ARIBAUD:
apt-get install uboot-envtools fw_printenv bootcmd
No result there? There should be.
sure. it's what I set into bootcmd.bak:
fw_setenv bootcmd.bak 'nand read.e 0x1200000 0x200000 0x600000;nand read.e 0x2000000 0x800000 0x1000000;bootm 0x1200000 0x2000000'
Ok.
the outputs all looked fine, after I changed the offset in config file to 0x0. Else I wouln't have written anything. But still I am not 100% sure about the sector size of 0x20000 (128KByte)
Well, the exact value can only be known with the source code for the U-Boot your board is running. Speaking of which... Did you look / ask Netgear for the source code? They should provide it to you as per GPL.
Yes: get control through JTAG.
Ok. I'll try.
Don't consider unsoldering / resoldering, all the more if sockets are involved, as long as you board has JTAG, either as a header or at least as contact points. A dumb JTAG probe and OpenOCD will cost you little and go a long way.
I've got the following soldering points:
a 1x3 Pin@2,54mm connector labeld J7 which could be a FAN connector.
a 2x5=10 PIN@2mm connector J1 near the ROM chip.
both connectors are on this picture: http://natisbad.org/NAS/pics/NETGEAR_ReadyNAS_Duo_v2_RND2000-200EUS_J1_and_J...
- 1x4 PIN @ 2,54mm connector.
So which one? Do I have to guess the pins?
Well, without information from Netgear, it's going to be hard to find out which is which. Considering the number of signals in a JTAG I/F, J7 and the 1x4 pin connector can be ruled out. However, it does not mean J1 is JTAG, and anyway, you'll have trouble finding the right pinout.
which probe should I chose? Something like these?
- Embedded Projects OpenOCD-USB Adapter
- Xilinx JTAG Parallel Cable III FPGA CPLD programmer LPT
- SainSmart USB Blaster Programmer Cable For FPGA CPLD JTAG Development
Board
- found a LPT programmer having nothing more than a 74HC244 chip.
Id' prefer the USB adapter...
I cannot advise on the compared merits of those. The ones I know are the BusPirate or BusBlaster (very versatile boards, no casing) and the Olimex ARM-USB-OCD[-H] (less generic than the BusPirate/Blaster but has a casing and comes with a serial port.
In any case, choose a probe for which your JTAG software will work.
btw, I found out there is a boot menu. When I hold the reset button during bootup, there is a boot menu offering: [...] Won't help much, I believe, since most rely on the boot process which is broken.
I think so too. For now, your best chance for recovery will be JTAG.
BTW, this becomes unrelated to U-Boot per se (at most, it's a non-mainline U-Boot, which should not be discussed here). I suggest moving the discussion outside of this list unless you have generic questions left regarding U-boot.
Amicalement,