Memory Hardware checker on Linux (userlevel) 2.6

Jul 22, 2007 3 Replies
B

hi all,



Anybody knows a RAM checker (to check wiring) runnable as user application on embedded linux (2.6 kernel) on XScale?



I would need a test that gives significant info on the usability of the memory wiring - the clue is to either circumvent the MMU or to have a test that works in spite of it.



Yes I know, if an application gets running, most of memory access must already be ok, we wouldnt have any app running otherwise - but for the rest of it i would need to make sure.



Is using /dev/mem a viable choice?



thx for hints, bernhard


Bernhard Mueller bernhard dot mueller at
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G

No, because you don't know where in physical memory the kernel will have allocated it's pages, or what other memory it is using for caches or buffers.

This task is really not supposed to be done under the OS. Can't you do it in your bootloader instead ?

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B

It should be part of a test suite that also includes several other functions (IO & communications, running on linux) and gives a summary report at the end. I'd like to do all that in a single run, if possible.

Bernhard Mueller bernhard dot mueller at
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G

I have done this in the past. I put the test in the bootloader (where it can easily test the maximum amount of memory) and stored a flag in the flash indicating whether the test passed or failed.

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