[PATCH 4/5] Nokia RX-51: Simplify calculation of attached kernel image address

[Pali Rohár]

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 at kernel.org>
---
 board/nokia/rx51/lowlevel_init.S | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/board/nokia/rx51/lowlevel_init.S b/board/nokia/rx51/lowlevel_init.S
index 4f76e80b20f1..c1785bc3f72f 100644
--- 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 */
-- 
2.20.1