diff options
Diffstat (limited to 'arch/openrisc/kernel/head.S')
| -rw-r--r-- | arch/openrisc/kernel/head.S | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S index c75018d22644..1088b5fca3bd 100644 --- a/arch/openrisc/kernel/head.S +++ b/arch/openrisc/kernel/head.S @@ -26,6 +26,7 @@ #include <asm/cache.h> #include <asm/spr_defs.h> #include <asm/asm-offsets.h> +#include <linux/of_fdt.h> #define tophys(rd,rs) \ l.movhi rd,hi(-KERNELBASE) ;\ @@ -440,6 +441,9 @@ _dispatch_do_ipage_fault: __HEAD .global _start _start: + /* save kernel parameters */ + l.or r25,r0,r3 /* pointer to fdt */ + /* * ensure a deterministic start */ @@ -471,7 +475,6 @@ _start: CLEAR_GPR(r22) CLEAR_GPR(r23) CLEAR_GPR(r24) - CLEAR_GPR(r25) CLEAR_GPR(r26) CLEAR_GPR(r27) CLEAR_GPR(r28) @@ -565,6 +568,18 @@ enable_mmu: // reset the simulation counters l.nop 5 + /* check fdt header magic word */ + l.lwz r3,0(r25) /* load magic from fdt into r3 */ + l.movhi r4,hi(OF_DT_HEADER) + l.ori r4,r4,lo(OF_DT_HEADER) + l.sfeq r3,r4 + l.bf _fdt_found + l.nop + /* magic number mismatch, set fdt pointer to null */ + l.or r25,r0,r0 +_fdt_found: + /* pass fdt pointer to or32_early_setup in r3 */ + l.or r3,r0,r25 LOAD_SYMBOL_2_GPR(r24, or32_early_setup) l.jalr r24 l.nop |