Hi,
Le 24/10/2011 20:37, Fabian van der Werf a écrit :
Okay, I think it may be a compiler problem. The latest code sourcery
compiler builds a barebox that breaks on usb. 2009q1-203 builds fine,
however.
In the usb code the compiler should be able to figure out that the
access is unaligned from the packed structure. So I guess it should
split up the access in multiple loads/stores. I will look into the
binaries to confirm this. The latest compiler may be broken or maybe
the default behaviour has changed because armv7 actually supports
unaligned access.
can't this be the same problem described here with gcc 4.6 :
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/791552
solved by this patch :
https://launchpadlibrarian.net/73908303/0001-USB-ehci-remove-structure-packing-from-ehci_def.patch
with the following explanation :
The kernel source marks ehci_regs as packed. gcc 4.6 treats all accesses to
packed structures as unaligned and ends up reading the status register
multiple times.
Eric
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