diff options
Diffstat (limited to 'arch/cris/arch-v32/boot')
| -rw-r--r-- | arch/cris/arch-v32/boot/compressed/head.S | 137 |
1 files changed, 39 insertions, 98 deletions
diff --git a/arch/cris/arch-v32/boot/compressed/head.S b/arch/cris/arch-v32/boot/compressed/head.S index 34cea10a899..f86208caf32 100644 --- a/arch/cris/arch-v32/boot/compressed/head.S +++ b/arch/cris/arch-v32/boot/compressed/head.S @@ -2,13 +2,12 @@ * Code that sets up the DRAM registers, calls the * decompressor to unpack the piggybacked kernel, and jumps. * - * Copyright (C) 1999 - 2003, Axis Communications AB + * Copyright (C) 1999 - 2006, Axis Communications AB */ #define ASSEMBLER_MACROS_ONLY -#include <asm/arch/hwregs/asm/reg_map_asm.h> -#include <asm/arch/hwregs/asm/gio_defs_asm.h> -#include <asm/arch/hwregs/asm/config_defs_asm.h> +#include <hwregs/asm/reg_map_asm.h> +#include <asm/arch/mach/startup.inc> #define RAM_INIT_MAGIC 0x56902387 #define COMMAND_LINE_MAGIC 0x87109563 @@ -22,114 +21,49 @@ start: di ;; Start clocks for used blocks. - move.d REG_ADDR(config, regi_config, rw_clk_ctrl), $r1 - move.d [$r1], $r0 - or.d REG_STATE(config, rw_clk_ctrl, cpu, yes) | \ - REG_STATE(config, rw_clk_ctrl, bif, yes) | \ - REG_STATE(config, rw_clk_ctrl, fix_io, yes), $r0 - move.d $r0, [$r1] - - ;; If booting from NAND flash we first have to copy some - ;; data from NAND flash to internal RAM to get the code - ;; that initializes the SDRAM. Lets copy 20 KB. This - ;; code executes at 0x38010000 if booting from NAND and - ;; we are guaranted that at least 0x200 bytes are good so - ;; lets start from there. The first 8192 bytes in the nand - ;; flash is spliced with zeroes and is thus 16384 bytes. - move.d 0x38010200, $r10 - move.d 0x14200, $r11 ; Start offset in NAND flash 0x10200 + 16384 - move.d 0x5000, $r12 ; Length of copy - - ;; Before this code the tools add a partitiontable so the PC - ;; has an offset from the linked address. -offset1: - lapcq ., $r13 ; get PC - add.d first_copy_complete-offset1, $r13 - -#include "../../lib/nand_init.S" - -first_copy_complete: - ;; Initialze the DRAM registers. + START_CLOCKS + + ;; Initialize the DRAM registers. cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized? beq dram_init_finished nop -#include "../../lib/dram_init.S" +#include "../../mach/dram_init.S" dram_init_finished: - lapcq ., $r13 ; get PC - add.d second_copy_complete-dram_init_finished, $r13 - - move.d REG_ADDR(config, regi_config, r_bootsel), $r0 - move.d [$r0], $r0 - and.d REG_MASK(config, r_bootsel, boot_mode), $r0 - cmp.d REG_STATE(config, r_bootsel, boot_mode, nand), $r0 - bne second_copy_complete ; No NAND boot - nop - - ;; Copy 2MB from NAND flash to SDRAM (at 2-4MB into the SDRAM) - move.d 0x40204000, $r10 - move.d 0x8000, $r11 - move.d 0x200000, $r12 - ba copy_nand_to_ram - nop -second_copy_complete: - - ;; Initiate the PA port. - move.d CONFIG_ETRAX_DEF_GIO_PA_OUT, $r0 - move.d REG_ADDR(gio, regi_gio, rw_pa_dout), $r1 - move.d $r0, [$r1] - - move.d CONFIG_ETRAX_DEF_GIO_PA_OE, $r0 - move.d REG_ADDR(gio, regi_gio, rw_pa_oe), $r1 - move.d $r0, [$r1] + GIO_INIT ;; Setup the stack to a suitably high address. ;; We assume 8 MB is the minimum DRAM and put ;; the SP at the top for now. move.d 0x40800000, $sp - ;; Figure out where the compressed piggyback image is - ;; in the flash (since we wont try to copy it to DRAM - ;; before unpacking). It is at _edata, but in flash. + ;; Figure out where the compressed piggyback image is. + ;; It is either in [NOR] flash (we don't want to copy it + ;; to DRAM before unpacking), or copied to DRAM + ;; by the [NAND] flash boot loader. + ;; The piggyback image is at _edata, but relative to where the + ;; image is actually located in memory, not where it is linked + ;; (the decompressor is linked at 0x40700000+ and runs there). ;; Use (_edata - herami) as offset to the current PC. - move.d REG_ADDR(config, regi_config, r_bootsel), $r0 - move.d [$r0], $r0 - and.d REG_MASK(config, r_bootsel, boot_mode), $r0 - cmp.d REG_STATE(config, r_bootsel, boot_mode, nand), $r0 - beq hereami2 - nop hereami: lapcq ., $r5 ; get PC and.d 0x7fffffff, $r5 ; strip any non-cache bit - move.d $r5, $r0 ; save for later - flash address of 'herami' + move.d $r5, $r0 ; source address of 'herami' add.d _edata, $r5 sub.d hereami, $r5 ; r5 = flash address of '_edata' move.d hereami, $r1 ; destination - ba 2f - nop -hereami2: - lapcq ., $r5 ; get PC - and.d 0x00ffffff, $r5 ; strip any non-cache bit - move.d $r5, $r6 - or.d 0x40200000, $r6 - move.d $r6, $r0 ; save for later - flash address of 'herami' - add.d _edata, $r5 - sub.d hereami2, $r5 ; r5 = flash address of '_edata' - add.d 0x40200000, $r5 - move.d hereami2, $r1 ; destination -2: + ;; Copy text+data to DRAM move.d _edata, $r2 ; end destination -1: move.w [$r0+], $r3 - move.w $r3, [$r1+] - cmp.d $r2, $r1 +1: move.w [$r0+], $r3 ; from herami+ source + move.w $r3, [$r1+] ; to hereami+ destination (linked address) + cmp.d $r2, $r1 ; finish when destination == _edata bcs 1b nop - move.d input_data, $r0 ; for the decompressor move.d $r5, [$r0] ; for the decompressor @@ -144,16 +78,24 @@ hereami2: nop ;; Save command line magic and address. - move.d _cmd_line_magic, $r12 - move.d $r10, [$r12] - move.d _cmd_line_addr, $r12 - move.d $r11, [$r12] + move.d _cmd_line_magic, $r0 + move.d $r10, [$r0] + move.d _cmd_line_addr, $r0 + move.d $r11, [$r0] + + ;; Save boot source indicator + move.d _boot_source, $r0 + move.d $r12, [$r0] ;; Do the decompression and save compressed size in _inptr jsr decompress_kernel nop + ;; Restore boot source indicator + move.d _boot_source, $r12 + move.d [$r12], $r12 + ;; Restore command line magic and address. move.d _cmd_line_magic, $r10 move.d [$r10], $r10 @@ -166,11 +108,10 @@ hereami2: move.d [$r0], $r9 ; flash address of compressed kernel move.d inptr, $r0 add.d [$r0], $r9 ; size of compressed kernel - cmp.d 0x40200000, $r9 - blo enter_kernel - nop - sub.d 0x40200000, $r9 - add.d 0x4000, $r9 + cmp.d 0x40000000, $r9 ; image in DRAM ? + blo enter_kernel ; no, must be [NOR] flash, jump + nop ; delay slot + and.d 0x001fffff, $r9 ; assume compressed kernel was < 2M enter_kernel: ;; Enter the decompressed kernel @@ -186,7 +127,7 @@ _cmd_line_magic: .dword 0 _cmd_line_addr: .dword 0 -is_nand_boot: - .dword 0 +_boot_source: + .dword 0 -#include "../../lib/hw_settings.S" +#include "../../mach/hw_settings.S" |