Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=247c3c959f5d5a7edd1d5561ffe29906129dab0b
Commit: 247c3c959f5d5a7edd1d5561ffe29906129dab0b
Parent: 5d23ff25b2d406b7fc1eb771d5dc4f1add0f2530
Author: Jesper Nilsson <[EMAIL PROTECTED]>
AuthorDate: Fri Nov 30 16:40:26 2007 +0100
Committer: Jesper Nilsson <[EMAIL PROTECTED]>
CommitDate: Fri Feb 8 11:06:26 2008 +0100
CRIS v32: Update compressed head.S
- Fixes for NAND and NOR flash booting.
- Use assembler macros for common tasks (clocks, general io etc)
- Use (EtraxFS or Artpec-3) machine specific include for dram and hardware
init.
---
arch/cris/arch-v32/boot/compressed/head.S | 325 ++++++++++++-----------------
1 files changed, 133 insertions(+), 192 deletions(-)
diff --git a/arch/cris/arch-v32/boot/compressed/head.S
b/arch/cris/arch-v32/boot/compressed/head.S
dissimilarity index 61%
index 34cea10..f86208c 100644
--- a/arch/cris/arch-v32/boot/compressed/head.S
+++ b/arch/cris/arch-v32/boot/compressed/head.S
@@ -1,192 +1,133 @@
-/*
- * Code that sets up the DRAM registers, calls the
- * decompressor to unpack the piggybacked kernel, and jumps.
- *
- * Copyright (C) 1999 - 2003, 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>
-
-#define RAM_INIT_MAGIC 0x56902387
-#define COMMAND_LINE_MAGIC 0x87109563
-
- ;; Exported symbols
-
- .globl input_data
-
- .text
-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.
- cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized?
- beq dram_init_finished
- nop
-
-#include "../../lib/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]
-
- ;; 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.
- ;; 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'
- 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
- bcs 1b
- nop
-
- move.d input_data, $r0 ; for the decompressor
- move.d $r5, [$r0] ; for the decompressor
-
- ;; Clear the decompressors BSS (between _edata and _end)
-
- moveq 0, $r0
- move.d _edata, $r1
- move.d _end, $r2
-1: move.w $r0, [$r1+]
- cmp.d $r2, $r1
- bcs 1b
- 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]
-
- ;; Do the decompression and save compressed size in _inptr
-
- jsr decompress_kernel
- nop
-
- ;; Restore command line magic and address.
- move.d _cmd_line_magic, $r10
- move.d [$r10], $r10
- move.d _cmd_line_addr, $r11
- move.d [$r11], $r11
-
- ;; Put start address of root partition in r9 so the kernel can use it
- ;; when mounting from flash
- move.d input_data, $r0
- move.d [$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
-
-enter_kernel:
- ;; Enter the decompressed kernel
- move.d RAM_INIT_MAGIC, $r8 ; Tell kernel that DRAM is initialized
- jump 0x40004000 ; kernel is linked to this address
- nop
-
- .data
-
-input_data:
- .dword 0 ; used by the decompressor
-_cmd_line_magic:
- .dword 0
-_cmd_line_addr:
- .dword 0
-is_nand_boot:
- .dword 0
-
-#include "../../lib/hw_settings.S"
+/*
+ * Code that sets up the DRAM registers, calls the
+ * decompressor to unpack the piggybacked kernel, and jumps.
+ *
+ * Copyright (C) 1999 - 2006, Axis Communications AB
+ */
+
+#define ASSEMBLER_MACROS_ONLY
+#include <hwregs/asm/reg_map_asm.h>
+#include <asm/arch/mach/startup.inc>
+
+#define RAM_INIT_MAGIC 0x56902387
+#define COMMAND_LINE_MAGIC 0x87109563
+
+ ;; Exported symbols
+
+ .globl input_data
+
+ .text
+start:
+ di
+
+ ;; Start clocks for used blocks.
+ START_CLOCKS
+
+ ;; Initialize the DRAM registers.
+ cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized?
+ beq dram_init_finished
+ nop
+
+#include "../../mach/dram_init.S"
+
+dram_init_finished:
+
+ 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.
+ ;; 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.
+
+hereami:
+ lapcq ., $r5 ; get PC
+ and.d 0x7fffffff, $r5 ; strip any non-cache bit
+ 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
+
+ ;; Copy text+data to DRAM
+
+ move.d _edata, $r2 ; end destination
+1: move.w [$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
+
+ ;; Clear the decompressors BSS (between _edata and _end)
+
+ moveq 0, $r0
+ move.d _edata, $r1
+ move.d _end, $r2
+1: move.w $r0, [$r1+]
+ cmp.d $r2, $r1
+ bcs 1b
+ nop
+
+ ;; Save command line magic and address.
+ 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
+ move.d _cmd_line_addr, $r11
+ move.d [$r11], $r11
+
+ ;; Put start address of root partition in r9 so the kernel can use it
+ ;; when mounting from flash
+ move.d input_data, $r0
+ move.d [$r0], $r9 ; flash address of compressed kernel
+ move.d inptr, $r0
+ add.d [$r0], $r9 ; size of compressed kernel
+ 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
+ move.d RAM_INIT_MAGIC, $r8 ; Tell kernel that DRAM is initialized
+ jump 0x40004000 ; kernel is linked to this address
+ nop
+
+ .data
+
+input_data:
+ .dword 0 ; used by the decompressor
+_cmd_line_magic:
+ .dword 0
+_cmd_line_addr:
+ .dword 0
+_boot_source:
+ .dword 0
+
+#include "../../mach/hw_settings.S"
-
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