Merge branch 'master' of http://git.denx.de/u-boot-samsung

[karo-tx-uboot.git] / arch / x86 / cpu / start16.S

diff --git a/arch/x86/cpu/start16.S b/arch/x86/cpu/start16.S
index 603bf1d2d3ecf8a05ae79c54e2bd4dd267800432..9550502e9ae8f58e79f24929945058a006924d4a 100644 (file)
--- a/arch/x86/cpu/start16.S
+++ b/arch/x86/cpu/start16.S
@@ -7,23 +7,7 @@
  * (C) Copyright 2002,2003
  * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #include <asm/global_data.h>
@@ -37,18 +21,16 @@
 .code16
 .globl start16
 start16:
+       /* Save BIST */
+       movl    %eax, %ecx
+
        /* Set the Cold Boot / Hard Reset flag */
        movl    $GD_FLG_COLD_BOOT, %ebx
 
-       /*
-        * First we let the BSP do some early initialization
-        * this code have to map the flash to its final position
-        */
-       jmp     board_init16
-.globl board_init16_ret
-board_init16_ret:
+       xorl    %eax, %eax
+       movl    %eax, %cr3    /* Invalidate TLB */
 
-       /* Turn of cache (this might require a 486-class CPU) */
+       /* Turn off cache (this might require a 486-class CPU) */
        movl    %cr0, %eax
        orl     $(X86_CR0_NW | X86_CR0_CD), %eax
        movl    %eax, %cr0
@@ -66,9 +48,11 @@ o32 cs       lgdt    gdt_ptr
        /* Flush the prefetch queue */
        jmp     ff
 ff:
-       /* Finally jump to the 32bit initialization code */
+
+       /* Finally restore BIST and jump to the 32bit initialization code */
        movw    $code32start, %ax
        movw    %ax, %bp
+       movl    %ecx, %eax
 o32 cs ljmp    *(%bp)
 
        /* 48-bit far pointer */
@@ -86,7 +70,7 @@ idt_ptr:
  * GDT is setup in a safe location in RAM
  */
 gdt_ptr:
-       .word   0x20            /* limit (32 bytes = 4 GDT entries) */
+       .word   0x1f            /* limit (31 bytes = 4 GDT entries - 1) */
        .long   BOOT_SEG + gdt  /* base */
 
 /* Some CPUs are picky about GDT alignment... */