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| author | Kyungmin Park <kmpark@infradead.org> | 2008-01-17 16:43:25 +0900 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2008-02-14 22:08:13 +0100 |
| commit | 751b9b5189f3274b03c809172631316d6b002c82 (patch) | |
| tree | 026f1808f4919d37b2d3855615041fb9d4bbcbc6 /cpu/arm1136/start.S | |
| parent | 21f6f9636f0e978397548751347425fbf8d42bb3 (diff) | |
| download | u-boot-imx-751b9b5189f3274b03c809172631316d6b002c82.zip u-boot-imx-751b9b5189f3274b03c809172631316d6b002c82.tar.gz u-boot-imx-751b9b5189f3274b03c809172631316d6b002c82.tar.bz2 | |
OneNAND Initial Program Loader (IPL) support
This patch enables the OneNAND boot within U-Boot.
Before this work, we used another OneNAND IPL called X-Loader based
on open source. With this work, we can build the oneboot.bin image
without other program.
The build sequence is simple.
First, it compiles the u-boot.bin
Second, it compiles OneNAND IPL
Finally, it becomes the oneboot.bin from OneNAND IPL and u-boot.bin
The mechanism is similar with NAND boot except it boots from itself.
Another thing is that you can only use the OneNAND IPL only to work
other bootloader such as RedBoot and so on.
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Diffstat (limited to 'cpu/arm1136/start.S')
| -rw-r--r-- | cpu/arm1136/start.S | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/cpu/arm1136/start.S b/cpu/arm1136/start.S index 17c7a83..8b765f1 100644 --- a/cpu/arm1136/start.S +++ b/cpu/arm1136/start.S @@ -35,6 +35,25 @@ #endif .globl _start _start: b reset +#ifdef CONFIG_ONENAND_IPL + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + +_hang: + .word do_hang + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 /* now 16*4=64 */ +#else ldr pc, _undefined_instruction ldr pc, _software_interrupt ldr pc, _prefetch_abort @@ -51,6 +70,7 @@ _not_used: .word not_used _irq: .word irq _fiq: .word fiq _pad: .word 0x12345678 /* now 16*4=64 */ +#endif /* CONFIG_ONENAND_IPL */ .global _end_vect _end_vect: @@ -139,7 +159,9 @@ relocate: /* relocate U-Boot to RAM */ adr r0, _start /* r0 <- current position of code */ ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ cmp r0, r1 /* don't reloc during debug */ +#ifndef CONFIG_ONENAND_IPL beq stack_setup +#endif /* CONFIG_ONENAND_IPL */ ldr r2, _armboot_start ldr r3, _bss_start @@ -156,26 +178,36 @@ copy_loop: /* Set up the stack */ stack_setup: ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */ +#ifdef CONFIG_ONENAND_IPL + sub sp, r0, #128 /* leave 32 words for abort-stack */ +#else sub r0, r0, #CFG_MALLOC_LEN /* malloc area */ sub r0, r0, #CFG_GBL_DATA_SIZE /* bdinfo */ #ifdef CONFIG_USE_IRQ sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ) #endif sub sp, r0, #12 /* leave 3 words for abort-stack */ +#endif /* CONFIG_ONENAND_IPL */ clear_bss: ldr r0, _bss_start /* find start of bss segment */ ldr r1, _bss_end /* stop here */ mov r2, #0x00000000 /* clear */ +#ifndef CONFIG_ONENAND_IPL clbss_l:str r2, [r0] /* clear loop... */ add r0, r0, #4 cmp r0, r1 bne clbss_l +#endif ldr pc, _start_armboot +#ifdef CONFIG_ONENAND_IPL +_start_armboot: .word start_oneboot +#else _start_armboot: .word start_armboot +#endif /* @@ -214,6 +246,8 @@ cpu_init_crit: bl lowlevel_init /* go setup pll,mux,memory */ mov lr, ip /* restore link */ mov pc, lr /* back to my caller */ + +#ifndef CONFIG_ONENAND_IPL /* ************************************************************************* * @@ -326,10 +360,17 @@ cpu_init_crit: .macro get_fiq_stack @ setup FIQ stack ldr sp, FIQ_STACK_START .endm +#endif /* CONFIG_ONENAND_IPL */ /* * exception handlers */ +#ifdef CONFIG_ONENAND_IPL + .align 5 +do_hang: + ldr sp, _TEXT_BASE /* use 32 words about stack */ + bl hang /* hang and never return */ +#else /* !CONFIG_ONENAND IPL */ .align 5 undefined_instruction: get_bad_stack @@ -415,3 +456,4 @@ rstctl: .word PM_RSTCTRL_WKUP #endif +#endif /* CONFIG_ONENAND_IPL */ |