Le 06/12/2013 20:09, Scott Wood a écrit :
On Wed, 2013-11-27 at 12:04 +0100, Christophe Leroy wrote:
Today, the only way to load kernels whose size is greater than 8Mbytes is to
activate CONFIG_PIN_TLB. Otherwise, the physical memory initially mapped is
limited to 8Mbytes. This patch sets up 24 Mbytes of initial memory regardless
of whether CONFIG_PIN_TLB is active or not. It allows to load "big" kernels
(for instance when activating CONFIG_LOCKDEP_SUPPORT) without having
to activate CONFIG_PIN_TLB.
So, what happens on boards with less than 24M memory present? Even if
you avoid explicitly referencing those addresses, what if there is a
speculative access -- or does 8xx not do that?
-Scott
Function setup_initial_memory_limit() in mm/init_32.c defines the limits
based on the parameters given by the bootloader.
As far as I know, the 8xx doesn't do speculative access just because an
area is loaded in a TLB Entry.
Christophe
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