ppc: qemu: Delete the temporary FDT virtual-physical mapping after U-Boot is relocated

After U-Boot is relocated to RAM already, the previous temporary FDT
virtual-physical mapping that was used in the pre-relocation phase
is no longer needed. Let's delete the mapping.

get_fdt_virt() might be used before and after relocation, update it
to return different virtual address of FDT.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

board/freescale/qemu-ppce500/qemu-ppce500.c

@@ -31,7 +31,10 @@ DECLARE_GLOBAL_DATA_PTR;
 
 static void *get_fdt_virt(void)
 {
-	return (void *)CONFIG_SYS_TMPVIRT;
+	if (gd->flags & GD_FLG_RELOC)
+		return (void *)gd->fdt_blob;
+	else
+		return (void *)CONFIG_SYS_TMPVIRT;
 }
 
 static uint64_t get_fdt_phys(void)
@@ -138,6 +141,12 @@ int misc_init_r(void)
 	 */
 	virtio_init();
 
+	/*
+	 * U-Boot is relocated to RAM already, let's delete the temporary FDT
+	 * virtual-physical mapping that was used in the pre-relocation phase.
+	 */
+	disable_tlb(find_tlb_idx((void *)CONFIG_SYS_TMPVIRT, 1));
+
 	return 0;
 }