Nokia RX-51: Simplify calculation of attached kernel image address

Now when board starup code does not copy image to CONFIG_SYS_TEXT_BASE
address there is no need to calculate all addresses from base address at
runtime. The only address which needs to be calculated is attached kernel
image address which can be simplified at compile time without need to know
CONFIG_SYS_TEXT_BASE address or relocation address at the runtime.

Signed-off-by: Pali Rohár <pali@kernel.org>

diff --git a/board/nokia/rx51/lowlevel_init.S b/board/nokia/rx51/lowlevel_init.S
index 4f76e80..c1785bc 100644 (file)
--- a/board/nokia/rx51/lowlevel_init.S
+++ b/board/nokia/rx51/lowlevel_init.S
@@ -6,11 +6,8 @@
 
 #include <config.h>
 
-relocaddr:             /* address of this relocaddr section after coping */
-       .word .         /* address of section (calculated at compile time) */
-
-startaddr:             /* address of u-boot after copying */
-       .word CONFIG_SYS_TEXT_BASE
+kernoffs:              /* offset of kernel image from this address */
+       .word KERNEL_OFFSET - (. - CONFIG_SYS_TEXT_BASE)
 
 kernaddr:              /* address of kernel after copying */
        .word KERNEL_ADDRESS
@@ -18,9 +15,6 @@ kernaddr:             /* address of kernel after copying */
 kernsize:              /* maximal size of kernel image */
        .word KERNEL_MAXSIZE
 
-kernoffs:              /* offset of kernel image in loaded u-boot */
-       .word KERNEL_OFFSET
-
 imagesize:             /* maximal size of image */
        .word IMAGE_MAXSIZE
 
@@ -53,16 +47,9 @@ save_boot_params:
  */
 
 copy_kernel_start:
-       adr     r0, relocaddr   /* r0 - address of section relocaddr */
-       ldr     r1, relocaddr   /* r1 - address of relocaddr after relocation */
-
-       /* r4 - calculated offset */
-       sub     r4, r0, r1
-
        /* r0 - start of kernel before */
-       ldr     r0, startaddr
-       add     r0, r0, r4
-       ldr     r1, kernoffs
+       adr     r0, kernoffs    /* r0 - current address of kernoffs section */
+       ldr     r1, kernoffs    /* r1 - offset of kernel image from kernoffs section */
        add     r0, r0, r1
 
        /* r3 - start of kernel after */