Peter Barada wrote:
On Fri, 2008-08-15 at 23:04 +0530, Syed Mohammed, Khasim wrote:
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Peter
Barada
Any suggestions on what can cause the JTAG to stop working after the
kernel starts?
I think you should disable Power Management. Which kernel are you using now?
2.6.22.18. I'm planning to move to 2.6.26 after the dust settles...
I'll try w/o power management, but any idea why power management might
affect JTAG?
The guy I share an office with (who's out on vacation) worked through
this with their tech support, who suggested replacing WFI instructions
with NOPs.
Look at cpu_v7_do_idle in arch/arm/mm/proc-v7.S. Changing the WFI to a
NOP did the trick for him.
Presumably power management was off, but even WFI (wait for interrupt)
put the CPU in a state that wasn't handled by the BDI firmware at the
time. I'm not sure if they resolved the issue in a later firmware
update or not. We didn't think the workaround was worthy of a Kconfig
option - hopefully updated firmware for the BDI box will address the issue.
- Josh
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