On Wed, May 5, 2010 at 1:59 PM, Stefano Babic <sba...@denx.de> wrote:
> Quotient Remainder wrote: > > > Out of interest, how did something like this get away with only causing > > an occasional failure? > > Well, there are some explanations. MMU is normally off and a Null > Pointer does not cause an exception in u-boot. If we get a failure, it > depends on the architecture we are using. On PowerPC, address 0 is > accessible and then we get no failure. In this particular case > (ubifsmount), the list is set but not used by the calling function. > Because writing to address 0 is allowed, the bug is not noticeable. > > Different is on arm, where I have found the problem. Because in this > case address 0 is not accessible at all, u-boot hangs and it is not > possible to avoid to see that we have a problem.... > > I've been using UBIFS on arm (1136) with the v2009.11 release and it works almost all the time. Sometimes U-Boot fails to mount the UBIFS (1 in 100 boots, maybe), and in these cases I was putting it down to forgetting to do a sync in Linux before rebooting. I wonder if this was the problem all along... > Best regards, > Stefano Babic > > -- > ===================================================================== > DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel > HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany > Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: off...@denx.de > ===================================================================== >
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