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Add a comment explaining why the OHCI mapping has been commented out.

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This commit is contained in:
Olivier Houchard 2006-07-15 00:09:53 +00:00
parent 109dad819f
commit 22e1aadef7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=160374
1 changed files with 9 additions and 0 deletions
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9
sys/arm/at91/kb920x_machdep.c
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@ -159,6 +159,15 @@ static const struct pmap_devmap kb920x_devmap[] = {
VM_PROT_READ|VM_PROT_WRITE,
PTE_NOCACHE,
},
/*
* We can't just map the OHCI registers VA == PA, because
* AT91RM92_OHCI_BASE belongs to the userland address space.
* We could just choose a different virtual address, but a better
* solution would probably be to just use pmap_mapdev() to allocate
* KVA, as we don't need the OHCI controller before the vm
* initialization is done. However, the AT91 resource allocation
* system doesn't know how to use pmap_mapdev() yet.
*/
#if 0
{
/*