running diagnostics application in user space to test hardware:
- From: mcharon@xxxxxxxxx
- Date: 7 Apr 2006 09:40:21 -0700
we are trying write diagnostics application in user space. the criteria
for the diagnostics
is that the testing should be done in user space as much as possible.
and we need to run the application on top of linux. cpu is powerPC.
memory test. how do you implement memory test from user space. If
it's done in user
space, there are only 2 options. The first option is using mmap but
with mmap option, how
do you know which area of memories are availble for testig, and which
ones are used by
other processes and kernels. The other option is to test memory using
the virtual address
returned by malloc. But this way, when you have a failure, how do you
know which physical
memory location is faulty? In both cases, do we need to be concerned
with paging?
2. do you also use mmap to access PCI device, pretty much the same way
that you use
mmap to access physical memory?
3. For certain hardware such as FE, the buffer address required by the
hardware has to
be in physical address form. From user space, malloc returns virtual
address. How do you
convert this to physical address so that it can be used by the
hardware. Also, how do you
ensure that no pagin occurs.
4. last but not least. Interrupt. I think you mentioned this to me when
we met. Do we
implement kernel driver to handle hardware interrupt? This driver will
dispatch interrupt
to the user app??
thank you in advance
.
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