Thanks Stefan,
I actually determined that after the git repository build did the same thing. I changed it to use the SPRN_TCR and SPRN_TSR values but I did see in processor.h where TSR and TCR are defined so I will modify it based on those values. The watchdog reset notification is very useful and we have done that with red boot on a different project so I will make an attempt to implement the same functionality. Basically you need to detect if the watchdog did force a reset and ideally how long the system was running before it reset to determine which partition to boot in a dual partition setup.
Thanks for the quick response. I will work to create a patch for this functionality according to the u-boot standards.
Mark
-----Original Message----- From: Stefan Roese [mailto:sr@denx.de] Sent: Thursday, May 20, 2010 4:55 AM To: u-boot@lists.denx.de Cc: Mark Maestas Subject: Re: [U-Boot] Watchdog support for ppc4xx
Hi Mark,
On Thursday 20 May 2010 00:27:50 Mark Maestas wrote:
I have a question about watchdog support for PPC_4xx. When I define CONFIG_WATCHDOG in canyonlands.h, I get an error when building cpu_init.c. The error code reads:
{standard input}: Assembler messages: {standard input}:133: Error: unsupported relocation against tcr {standard input}:141: Error: unsupported relocation against tcr {standard input}:146: Error: unsupported relocation against tsr {standard input}:154: Error: unsupported relocation against tsr make[1]: *** [cpu_init.o] Error 1
Shouldn't this work?
It *should*. But unfortunately it doesn't. I just checked this here myself. I get the same error. Seems that the "tcr/tsr" defines need to be converted to upper-case. It would be great if you could send a patch for this.
Also I would like to determine in u-boot if a reset was caused by the watchdog timer using the TSR WRS field. If it was reset by the watchdog we will boot into a failsafe partition to protect against system update errors.
Has anyone done something like this?
Such a detection is not implemented for PPC4xx. Not sure if it's implemented for any other architecture.
Cheers, Stefan
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