Activating CONFIG_PIN_TLB allows access to the 24 first Mbytes of memory at
bootup instead of 8. It is needed for "big" kernels for instance when activating
CONFIG_LOCKDEP_SUPPORT. This needs to be taken into account in init_32 too,
otherwise memory allocation soon fails after startup.
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
diff -ur linux-3.11.org/arch/powerpc/kernel/head_8xx.S
linux-3.11/arch/powerpc/kernel/head_8xx.S
--- linux-3.11.org/arch/powerpc/mm/init_32.c 2013-09-02 22:46:10.000000000
+0200
+++ linux-3.11/arch/powerpc/mm/init_32.c 2013-09-09 11:28:54.000000000
+0200
@@ -213,7 +213,12 @@
*/
BUG_ON(first_memblock_base != 0);
+#ifdef CONFIG_PIN_TLB
+ /* 8xx can only access 24MB at the moment */
+ memblock_set_current_limit(min_t(u64, first_memblock_size, 0x01800000));
+#else
/* 8xx can only access 8MB at the moment */
memblock_set_current_limit(min_t(u64, first_memblock_size, 0x00800000));
+#endif
}
#endif /* CONFIG_8xx */
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