howto unbrick QNAP TS-219P

["Rob J. Epping" <rob.epping@gmail.com>]

Hi

I've been impatient enough to brick my TS-219P by bubt-ing (the TS has
a serial console) the u-boot with a version I compiled from the QNAP
sources (version 3.5.3; buildlog available).

Now u-boot either hangs after

------ begin snippet
Addresses 8M - 0M are saved for the U-Boot usage.
Mem malloc Initialization (8M - 7M): Done
------ end snippet

or reboots after an "undefined instruction"

------ begin snippet
Addresses 8M - 0M are saved for the U-Boot usage.
Mem malloc Initialization (8M - 7M): Done
undefined instruction
pc : [<000028e4>]          lr : [<00000064>]
sp : 005ffed0  ip : 00000010     fp : ff000000
r10: 0000ffff  r9 : 00600498     r8 : 00000000
r7 : 0068006c  r6 : 00000000     r5 : 000005fa  r4 : 00000000
r3 : 00000000  r2 : 00000000     r1 : 00000000  r0 : 00000000
Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
Resetting CPU ...
------ end snippet

Does anybody know of ways to recover the device?

I think I need JTAG to fix this, but can't find the connection(s) for it.

Are there other possibilities?

Any help is appreciated.
--
GRTNX,
RobJE