[U-Boot] [PATCH] arm64: Fix layerscape mmu setup

[Alexander Graf]

With commit 7985cdf we converted all systems except for the Layerscape
SoCs to the generic descriptor table based page table setup.

On the Layerscape SoCs however, we just provide an empty table stub
and do the setup ourselves. To reserve enough memory for the tables,
we need to override the default counting mechanism which would end up
with an empty table because we have no maps.

Fixes: 7985cdf
Reported-by: York Sun <york.sun at nxp.com>
CC: Alison Wang <alison.wang at nxp.com>
CC: Prabhakar Kushwaha <prabhakar.kushwaha at nxp.com>
Signed-off-by: Alexander Graf <agraf at suse.de>
---
 arch/arm/cpu/armv8/cache_v8.c           | 2 +-
 arch/arm/cpu/armv8/fsl-layerscape/cpu.c | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
index d1bd06b..1615542 100644
--- a/arch/arm/cpu/armv8/cache_v8.c
+++ b/arch/arm/cpu/armv8/cache_v8.c
@@ -320,7 +320,7 @@ static int count_required_pts(u64 addr, int level, u64 maxaddr)
 }
 
 /* Returns the estimated required size of all page tables */
-u64 get_page_table_size(void)
+__weak u64 get_page_table_size(void)
 {
 	u64 one_pt = MAX_PTE_ENTRIES * sizeof(u64);
 	u64 size = 0;
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index 7404bd9..4b9e209 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -410,6 +410,11 @@ static inline void final_mmu_setup(void)
 	 */
 }
 
+u64 get_page_table_size(void)
+{
+	return 0x10000;
+}
+
 int arch_cpu_init(void)
 {
 	icache_enable();
-- 
1.8.5.6