-/* $Id: head.S,v 1.7 2005/03/07 12:11:06 starvik Exp $
- *
+/*
* Rescue code, made to reside at the beginning of the
* flash-memory. when it starts, it checks a partition
* table at the first sector after the rescue sector.
* Partition table format:
*
* Code transparency:
- *
+ *
* 2 bytes [opcode 'nop']
* 2 bytes [opcode 'di']
* 4 bytes [opcode 'ba <offset>', 8-bit or 16-bit version]
* 2 bytes [opcode 'nop', delay slot]
*
- * Table validation (at +10):
- *
+ * Table validation (at +10):
+ *
* 2 bytes [magic/version word for partitiontable - 0xef, 0xbe]
* 2 bytes [length of all entries plus the end marker]
* 4 bytes [checksum for the partitiontable itself]
*
- * Entries, each with the following format, last has offset -1:
- *
+ * Entries, each with the following format, last has offset -1:
+ *
* 4 bytes [offset in bytes, from start of flash]
* 4 bytes [length in bytes of partition]
* 4 bytes [checksum, simple longword sum]
* End marker
*
* 4 bytes [-1]
- *
+ *
* 10 bytes [0, padding]
- *
+ *
* Bit 0 in flags signifies RW or RO. The rescue code only bothers
* to check the checksum for RO partitions, since the others will
* change their data without updating the checksums. A 1 in bit 0
*
* During the wait for serial input, the status LED will flash so the
* user knows something went wrong.
- *
- * Copyright (C) 1999, 2000, 2001, 2002, 2003 Axis Communications AB
+ *
+ * Copyright (C) 1999-2007 Axis Communications AB
*/
+#ifdef CONFIG_ETRAX_AXISFLASHMAP
+
#define ASSEMBLER_MACROS_ONLY
#include <asm/arch/sv_addr_ag.h>
;; The partitiontable is looked for at the first sector after the boot
;; sector. Sector size is 65536 bytes in all flashes we use.
-
+
#define PTABLE_START CONFIG_ETRAX_PTABLE_SECTOR
#define PTABLE_MAGIC 0xbeef
;; having setup the DRAM etc). It is the same length as the on-chip
;; ROM loads, so the same host loader can be used to load a rescued
;; product as well as one booted through the Etrax serial boot code.
-
+
#define CODE_START 0x40000000
#define CODE_LENGTH 784
#define SERRECC R_SERIAL2_REC_CTRL
#define SERRDAT R_SERIAL2_REC_DATA
#define SERSTAT R_SERIAL2_STATUS
-#endif
+#endif
#ifdef CONFIG_ETRAX_RESCUE_SER3
#define SERXOFF R_SERIAL3_XOFF
#define SERBAUD R_SERIAL3_BAUD
#define RAM_INIT_MAGIC 0x56902387
.text
-
+
;; This is the entry point of the rescue code
;; 0x80000000 if loaded in flash (as it should be)
- ;; since etrax actually starts at address 2 when booting from flash, we
+ ;; Since etrax actually starts at address 2 when booting from flash, we
;; put a nop (2 bytes) here first so we dont accidentally skip the di
- nop
+ nop
di
jump in_cache ; enter cached area instead
in_cache:
- ;; first put a jump test to give a possibility of upgrading the rescue code
- ;; without erasing/reflashing the sector. we put a longword of -1 here and if
- ;; it is not -1, we jump using the value as jump target. since we can always
- ;; change 1's to 0's without erasing the sector, it is possible to add new
+ ;; First put a jump test to give a possibility of upgrading the
+ ;; rescue code without erasing/reflashing the sector.
+ ;; We put a longword of -1 here and if it is not -1, we jump using
+ ;; the value as jump target. Since we can always change 1's to 0's
+ ;; without erasing the sector, it is possible to add new
;; code after this and altering the jumptarget in an upgrade.
jtcd: move.d [jumptarget], $r0
cmp.d 0xffffffff, $r0
beq no_newjump
nop
-
+
jump [$r0]
-jumptarget:
+jumptarget:
.dword 0xffffffff ; can be overwritten later to insert new code
-
+
no_newjump:
-#ifdef CONFIG_ETRAX_ETHERNET
+#ifdef CONFIG_ETRAX_ETHERNET
;; Start MII clock to make sure it is running when tranceiver is reset
move.d 0x3, $r0 ; enable = on, phy = mii_clk
move.d $r0, [R_NETWORK_GEN_CONFIG]
#endif
-
+
;; We need to setup the bus registers before we start using the DRAM
#include "../../lib/dram_init.S"
;; we now should go through the checksum-table and check the listed
;; partitions for errors.
-
+
move.d PTABLE_START, $r3
move.d [$r3], $r0
cmp.d NOP_DI, $r0 ; make sure the nop/di is there...
bne do_rescue
nop
-
+
;; skip the code transparency block (10 bytes).
addq 10, $r3
-
+
;; check for correct magic
-
+
move.w [$r3+], $r0
cmp.w PTABLE_MAGIC, $r0
bne do_rescue ; didn't recognize - trig rescue
cmp.d $r0, $r4
bne do_rescue ; didn't match - trig rescue
nop
-
+
;; ptable is ok. validate each entry.
moveq -1, $r7
-
+
ploop: move.d [$r3+], $r1 ; partition offset (from ptable start)
bne notfirst ; check if it is the partition containing ptable
nop ; yes..
sub.d $r8, $r2 ; minus the ptable length
ba bosse
nop
-notfirst:
+notfirst:
cmp.d -1, $r1 ; the end of the ptable ?
beq flash_ok ; if so, the flash is validated
move.d [$r3+], $r2 ; partition length
bpl 1f
nop
move.d $r1, $r7 ; remember boot partition offset
-1:
-
+1:
add.d PTABLE_START, $r1
-
+
jsr checksum ; checksum the partition
-
+
cmp.d $r0, $r5
beq ploop ; checksums matched, go to next entry
nop
;; otherwise fall through to the rescue code.
-
+
do_rescue:
;; setup port PA and PB default initial directions and data
;; (so we can flash LEDs, and so that DTR and others are set)
-
+
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR, $r0
move.b $r0, [R_PORT_PA_DIR]
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r0
move.b $r0, [R_PORT_PA_DATA]
-
+
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR, $r0
move.b $r0, [R_PORT_PB_DIR]
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r0
move.b $r0, [R_PORT_PB_DATA]
;; setup the serial port at 115200 baud
-
+
moveq 0, $r0
- move.d $r0, [SERXOFF]
+ move.d $r0, [SERXOFF]
move.b 0x99, $r0
- move.b $r0, [SERBAUD] ; 115.2kbaud for both transmit and receive
+ move.b $r0, [SERBAUD] ; 115.2kbaud for both transmit and receive
- move.b 0x40, $r0 ; rec enable
- move.b $r0, [SERRECC]
+ move.b 0x40, $r0 ; rec enable
+ move.b $r0, [SERRECC]
moveq 0, $r1 ; "timer" to clock out a LED red flash
move.d CODE_START, $r3 ; destination counter
movu.w CODE_LENGTH, $r4; length
-
+
wait_ser:
addq 1, $r1
#ifndef CONFIG_ETRAX_NO_LEDS
nop
1: not $r0 ; clear bit
and.d $r0, $r2
-2:
+2:
#ifdef CONFIG_ETRAX_PA_LEDS
- move.b $r2, [R_PORT_PA_DATA]
-#endif
+ move.b $r2, [R_PORT_PA_DATA]
+#endif
#ifdef CONFIG_ETRAX_PB_LEDS
- move.b $r2, [R_PORT_PB_DATA]
+ move.b $r2, [R_PORT_PB_DATA]
#endif
#ifdef CONFIG_ETRAX_90000000_LEDS
move.b $r2, [0x90000000]
#endif
#endif
-
+
;; check if we got something on the serial port
-
+
move.b [SERSTAT], $r0
btstq 0, $r0 ; data_avail
bpl wait_ser
move.b [SERRDAT], $r0
move.b $r0, [$r3+]
-
+
subq 1, $r4 ; decrease length
bne wait_ser
nop
;; jump into downloaded code
- move.d RAM_INIT_MAGIC, $r8 ; Tell next product that DRAM is initialized
+ move.d RAM_INIT_MAGIC, $r8 ; Tell next product that DRAM is
+ ; initialized
jump CODE_START
flash_ok:
nop
move.d PTABLE_START, $r7; otherwise use the ptable start
1:
- move.d RAM_INIT_MAGIC, $r8 ; Tell next product that DRAM is initialized
+ move.d RAM_INIT_MAGIC, $r8 ; Tell next product that DRAM is
+ ; initialized
jump $r7 ; boot!
moveq 0, $r0
moveq CONFIG_ETRAX_FLASH1_SIZE, $r6
- ;; If the first physical flash memory is exceeded wrap to the second one.
+ ;; If the first physical flash memory is exceeded wrap to the second one
btstq 26, $r1 ; Are we addressing first flash?
bpl 1f
nop
3: move.d MEM_CSE1_START, $r1 ; wrap to second flash
ba 2b
nop
+
+#endif
projects / platform / kernel / linux-3.10.git / commitdiff