tree 6df61604f244537719795b796a4c93b5ed8a8d47
parent 3514141aedc16c7344117d5bd79ec1310edf8fb3
author Benjamin Herrenschmidt <benh@kernel.crashing.org> 1245352659 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1245991045 +1000

powerpc: Map more memory early on 601 processors

The 32-bit kernel relies on some memory being mapped covering
the kernel text,data and bss at least, early during boot before
the full MMU setup is done. On 32-bit "classic" processors, this
is done using BAT registers.

On 601, the size of BATs is limited to 8M and we use 2 of them
for that initial mapping. This can become quite tight when enabling
features like lockdep, so let's use a 3rd one to bump that mapping
from 16M to 24M. We keep the 4th BAT free as it can be useful for
debugging early boot code to map things like serial ports.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>