[U-Boot] [PATCH 1/3] x86: Change 4-level page table base address to low memory

[Bin Meng]

At present the 4-level page table base address for 64-bit U-Boot
proper is assigned an address that conflicts with CONFIG_LOADADDR.
Change it to an address within the low memory range instead.

Fixes crashes seen when 'dhcp' on QEMU x86_64 with
"-net nic -net user,tftp=.,bootfile=u-boot".

Reported-by: Alexander Graf <agraf at suse.de>
Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
---

 arch/x86/cpu/i386/cpu.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/cpu/i386/cpu.c b/arch/x86/cpu/i386/cpu.c
index 208ef08..af42431 100644
--- a/arch/x86/cpu/i386/cpu.c
+++ b/arch/x86/cpu/i386/cpu.c
@@ -462,6 +462,7 @@ int cpu_has_64bit(void)
 		has_long_mode();
 }
 
+#define PAGETABLE_BASE		0x80000
 #define PAGETABLE_SIZE		(6 * 4096)
 
 /**
@@ -523,10 +524,7 @@ int cpu_jump_to_64bit_uboot(ulong target)
 	uint32_t *pgtable;
 	func_t func;
 
-	/* TODO(sjg at chromium.org): Find a better place for this */
-	pgtable = (uint32_t *)0x1000000;
-	if (!pgtable)
-		return -ENOMEM;
+	pgtable = (uint32_t *)PAGETABLE_BASE;
 
 	build_pagetable(pgtable);
 
-- 
2.7.4