Your email address will not be published. I soldered headers on JTAG port and tried to connect with flyswatter and openocd. As seen previously , the bootloader checks the reset pin, and if asserted, it boots into a recovery image instead of booting the main image:. So i think I have similar issue as you described. According to the datasheet, this will:. Instead, I opted to simply patch the bootloader on the flash chip. After a reboot, lo and behold, JTAG was up and running without issues:.
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Leave a Reply Cancel reply Your zyxel p-320w address will not be published. That way we zyxel p-320w possibly run a better firmware, like dd-wrt or OpenWrt. Neither of this seemed to work.
This one has two which according to Cisco RF engineer is for redundancy, but with the two built-in omni-directional 2dbi antennas,there should be of little effect. Just connect to this pin rather than TDO pin?
Missing R 0-ohm jumper. May 2, at On ZyXEL jumper is ok.
So i think I have similar issue as you described. The checksum field itself p-32w0 set zyxel p-320w 0xFFFFFFFF at zyxel p-320w time of calculation, and the checksum is calculated over the entire firmware update file, except for the board ID string at the very end.
Having patched the OS, I needed to write it back to the flash chip. According to the datasheet, this will:. Not wanting to de-solder the flash chip yet zyxel p-320w, I opted to apply the patches via a firmware update.
First, I could simply set a breakpoint on this conditional branch and change the register contents so that p-3220w recovery image is never loaded. See my previous posts for more details on the programmer that I used to read and write to the flash chip. I soldered headers on JTAG port and tried to zyxel p-320w with flyswatter and openocd.
February 21, at 7: February 5, at 2: Or I zyxel p-320w buy any of your products, if you sell something.
zyxel p-320w It turns out that zyxsl is a standard CRC32 checksum that is stored in the firmware footer:. As seen previouslythe bootloader checks the reset pin, and if asserted, it zyxel p-320w into a recovery image instead of booting the main image:.
After looking on traces.
zyxel p-320w February 21, at 1: Luckily both were relatively easy to fix. Hooked with logic analyser and noticed that there are signals on some pins of header and some of them correlate zyxel p-320w well with LEDs blinking.
And yes, I re-soldered the chip afterwards. Hi Craig, thx for a cool write-up!
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On both routers i have 0. May 1, at May 24, at 7: This is just p-230w one bit zyxel p-320w to the instruction opcode:. Desoldering the flash chip and overwriting the bootloader with this patch got me past the bootloader zyxel p-320w into the main OS:. Since the OS image had been modified, I first needed to figure out the checksum zyxel p-320w the firmware update file.
All pins are directly connected to the chip. Besides being a PITA, this approach turned out to be impractical due to the following piece of earlier code:. I traversed paths from pins to micro controller.
Is there any way to make a donation to support your p-320a There were two solutions to this problem. June 18, at After a zyxel p-320w, lo and behold, JTAG was up zyxel p-320w running without issues:. No idea to copy the dump of The individually calibrated ART parttion.
I especially appreciate that you develop highly innovative open source software such as for example the reaver. Hi, Zyxel p-320w Shaw, Sure it can. June 4, at Your email address will not be published. July 18, at 2: What this means is that I would have to enter JTAG debug mode after the PLL was configured, but before the reset button was checked; zyxel p-320w race condition that was difficult to reliably to win.
Hi Craig, what you are doing is awesome, indeed. Thanks in no small part to copious debug strings littered throughout the code and some leaked Atheros datasheetsI made zyxel p-320w progress in statically disassembling the code.