ADS8260 Hang

ADS8260 Hang

[challaharikumar]

Hi All,

I having been trying to bring up the ADS8260 board and incidentally ran
into some problems.

I initially tried using Linux 2.4.1 kernel and it worked fine and the
board was up.
I upgraded to 2.4.17 and I found out that the system started hanging
during boot up.

I compiled 2.4.17 for ppc boot. (I already have ppc boot on my ADS board
and I test my development by tftp boot'ing the kernel image.

I tried tracking down where the hang could be and ended up at the RFI
instruction where its waiting to complete the MMU initialization. The
system executes SYNC instruction and then hangs. (arch/ppc/kernel/head.S)

I tried comparing the file head.S between 2.4.1 and 2.4.17. I found out
some patches done inside the 2.4.1 had been made generic. There were
patches for the BAT initialization and RAM mapping on the MPC8260.

Is there an update on the files?
Should the patches be done for 2.4.17 as well ?

Any suggestions or pointers could be very helpful.

[Running on x86 with Red Hat 8.0 and cross compiling for PPC.]

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Re: ADS8260 Hang

[Dan Malek]

challaharikumar wrote:

> I tried tracking down where the hang could be and ended up
> at the RFI instruction where its waiting to complete the MMU
> initialization. The system executes SYNC instruction and then hangs.
> (arch/ppc/kernel/head.S)

Your tools are fooling you, this isn't the problem.  The mapping of
memory for 82xx works just fine.  There may be something specific to
your board that is incorrect, but this mmu initialization at this
point is not the problem.

Why are you using such an old kernel?  Please update to something
more recent.

	-- Dan

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Re: ADS8260 Hang

[Wolfgang Denk]

In message <001101c42832$ec117760$3401080a@telxsi.com> you wrote:
>
> I initially tried using Linux 2.4.1 kernel and it worked fine and the
> board was up.
> I upgraded to 2.4.17 and I found out that the system started hanging
> during boot up.

I guess you didn't read the FAQ; see
http://www.denx.de/twiki/bin/view/DULG/LinuxHangsAfterUncompressingKernel

I think you must unset the "clocks_in_mhz" environment variable.

> I tried tracking down where the hang could be and ended up at the RFI
> instruction where its waiting to complete the MMU initialization. The
> system executes SYNC instruction and then hangs. (arch/ppc/kernel/head.S)

I think you are hunting a ghost; and again you didn't read the FAQ; see
http://www.denx.de/twiki/bin/view/DULG/HowToSingleStepThroughRFIInstruction

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"When the only  tool  you  have  is  a  hammer,  you  tend  to  treat
everything as if it were a nail."                    - Abraham Maslow

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