#include <config.h>
#include <version.h>
+#include <asm/global_data.h>
+#include <asm/processor-flags.h>
.section .text
/* Turn of cache (this might require a 486-class CPU) */
movl %cr0, %eax
- orl $0x60000000, %eax
+ orl $(X86_CR0_NW | X86_CR0_CD), %eax
movl %eax, %cr0
wbinvd
/* Tell 32-bit code it is being entered from an in-RAM copy */
- movw $0x0000, %bx
+ movw $GD_FLG_WARM_BOOT, %bx
_start:
/* This is the 32-bit cold-reset entry point */
/* Clear the interupt vectors */
lidt blank_idt_ptr
- /*
- * Skip low-level board and memory initialization if not starting
- * from cold-reset. This allows us to do a fail safe boot-strap
- * into a new build of U-Boot from a known-good boot flash
- */
- movw $0x0001, %ax
- cmpw %ax, %bx
- jne mem_init_ret
-
- /* We call a few functions in the board support package
- * since we have no stack yet we'll have to use %ebp
- * to store the return address */
-
/* Early platform init (setup gpio, etc ) */
- mov $early_board_init_ret, %ebp
jmp early_board_init
+.globl early_board_init_ret
early_board_init_ret:
- /* size memory */
- mov $mem_init_ret, %ebp
- jmp mem_init
-mem_init_ret:
-
- /* fetch memory size (into %eax) */
- mov $get_mem_size_ret, %ebp
- jmp get_mem_size
-get_mem_size_ret:
-
-#if CONFIG_SYS_SDRAM_ECC_ENABLE
- /* Skip ECC initialization if not starting from cold-reset */
- movl %ebx, %ecx
- andl $GD_FLG_COLD_BOOT, %ecx
- jz init_ecc_ret
- mov $init_ecc_ret, %ebp
- jmp init_ecc
-
-init_ecc_ret:
-#endif
-
- /* Check we have enough memory for stack */
- movl $CONFIG_SYS_STACK_SIZE, %ecx
- cmpl %ecx, %eax
- jb die
-mem_ok:
- /* Set stack pointer to upper memory limit*/
- movl %eax, %esp
+ /* Initialise Cache-As-RAM */
+ jmp car_init
+.globl car_init_ret
+car_init_ret:
+ /*
+ * We now have CONFIG_SYS_CAR_SIZE bytes of Cache-As-RAM (or SRAM,
+ * or fully initialised SDRAM - we really don't care which)
+ * starting at CONFIG_SYS_CAR_ADDR to be used as a temporary stack
+ */
+ movl $CONFIG_SYS_INIT_SP_ADDR, %esp
+ movl $CONFIG_SYS_INIT_GD_ADDR, %ebp
- /* Test the stack */
- pushl $0
- popl %eax
- cmpl $0, %eax
- jne no_stack
- push $0x55aa55aa
- popl %ebx
- cmpl $0x55aa55aa, %ebx
- jne die
+ /* Set Boot Flags in Global Data */
+ movl %ebx, (GD_FLAGS * 4)(%ebp)
- wbinvd
+ /* Determine our load offset (and put in Global Data) */
+ call 1f
+1: popl %ecx
+ subl $1b, %ecx
+ movl %ecx, (GD_LOAD_OFF * 4)(%ebp)
- /* Set the upper memory limit parameter */
- movl %esp, %eax
- subl $CONFIG_SYS_STACK_SIZE, %eax
+ /* Set parameter to board_init_f() to boot flags */
+ movl (GD_FLAGS * 4)(%ebp), %eax
call board_init_f /* Enter, U-boot! */
/* indicate (lack of) progress */
movw $0x85, %ax
+ jmp die
+
+.globl relocate_code
+.type relocate_code, @function
+relocate_code:
+ /*
+ * SDRAM has been initialised, U-Boot code has been copied into
+ * RAM, BSS has been cleared and relocation adjustments have been
+ * made. It is now time to jump into the in-RAM copy of U-Boot
+ *
+ * %eax = Address of top of stack
+ * %edx = Address of Global Data
+ * %ecx = Base address of in-RAM copy of U-Boot
+ */
+
+ /* Setup stack in RAM */
+ movl %eax, %esp
+
+ /* Setup call address of in-RAM copy of board_init_r() */
+ movl $board_init_r, %ebp
+ addl (GD_RELOC_OFF * 4)(%edx), %ebp
+
+ /* Setup parameters to board_init_r() */
+ movl %edx, %eax
+ movl %ecx, %edx
+
+ /* Jump to in-RAM copy of board_init_r() */
+ call *%ebp
+
die: hlt
jmp die
hlt