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-/*
- * 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.
- * the partition table was generated by the product builder
- * script and contains offsets, lengths, types and checksums
- * for each partition that this code should check.
- *
- * If any of the checksums fail, we assume the flash is so
- * corrupt that we cant use it to boot into the ftp flash
- * loader, and instead we initialize the serial port to
- * receive a flash-loader and new flash image. we dont include
- * any flash code here, but just accept a certain amount of
- * bytes from the serial port and jump into it. the downloaded
- * code is put in the cache.
- *
- * The partitiontable is designed so that it is transparent to
- * code execution - it has a relative branch opcode in the
- * beginning that jumps over it. each entry contains extra
- * data so we can add stuff later.
- *
- * 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):
- *
- * 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:
- *
- * 4 bytes [offset in bytes, from start of flash]
- * 4 bytes [length in bytes of partition]
- * 4 bytes [checksum, simple longword sum]
- * 2 bytes [partition type]
- * 2 bytes [flags, only bit 0 used, ro/rw = 1/0]
- * 16 bytes [reserved for future use]
- *
- * 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
- * means RO, 0 means RW. That way, it is possible to set a partition
- * in RO mode initially, and later mark it as RW, since you can always
- * write 0's to the flash.
- *
- * During the wait for serial input, the status LED will flash so the
- * user knows something went wrong.
- *
- * Copyright (C) 1999-2007 Axis Communications AB
- */
-
-#ifdef CONFIG_ETRAX_AXISFLASHMAP
-
-#define ASSEMBLER_MACROS_ONLY
-#include <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
-
- ;; The normal Etrax100 on-chip boot ROM does serial boot at 0x380000f0.
- ;; That is not where we put our downloaded serial boot-code.
- ;; The length is enough for downloading code that loads the rest
- ;; of itself (after 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
-
-#ifdef CONFIG_ETRAX_RESCUE_SER0
-#define SERXOFF R_SERIAL0_XOFF
-#define SERBAUD R_SERIAL0_BAUD
-#define SERRECC R_SERIAL0_REC_CTRL
-#define SERRDAT R_SERIAL0_REC_DATA
-#define SERSTAT R_SERIAL0_STATUS
-#endif
-#ifdef CONFIG_ETRAX_RESCUE_SER1
-#define SERXOFF R_SERIAL1_XOFF
-#define SERBAUD R_SERIAL1_BAUD
-#define SERRECC R_SERIAL1_REC_CTRL
-#define SERRDAT R_SERIAL1_REC_DATA
-#define SERSTAT R_SERIAL1_STATUS
-#endif
-#ifdef CONFIG_ETRAX_RESCUE_SER2
-#define SERXOFF R_SERIAL2_XOFF
-#define SERBAUD R_SERIAL2_BAUD
-#define SERRECC R_SERIAL2_REC_CTRL
-#define SERRDAT R_SERIAL2_REC_DATA
-#define SERSTAT R_SERIAL2_STATUS
-#endif
-#ifdef CONFIG_ETRAX_RESCUE_SER3
-#define SERXOFF R_SERIAL3_XOFF
-#define SERBAUD R_SERIAL3_BAUD
-#define SERRECC R_SERIAL3_REC_CTRL
-#define SERRDAT R_SERIAL3_REC_DATA
-#define SERSTAT R_SERIAL3_STATUS
-#endif
-
-#define NOP_DI 0xf025050f
-#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
- ;; put a nop (2 bytes) here first so we dont accidentally skip the di
-
- 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
- ;; 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:
- .dword 0xffffffff ; can be overwritten later to insert new code
-
-no_newjump:
-#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, $r0
- bne do_rescue ; didn't recognize - trig rescue
- nop
-
- ;; check for correct ptable checksum
-
- movu.w [$r3+], $r2 ; ptable length
- move.d $r2, $r8 ; save for later, length of total ptable
- addq 28, $r8 ; account for the rest
- move.d [$r3+], $r4 ; ptable checksum
- move.d $r3, $r1
- jsr checksum ; r1 source, r2 length, returns in r0
-
- 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..
- move.d $r8, $r1 ; for its checksum check, skip the ptable
- move.d [$r3+], $r2 ; partition length
- sub.d $r8, $r2 ; minus the ptable length
- ba bosse
- nop
-notfirst:
- cmp.d -1, $r1 ; the end of the ptable ?
- beq flash_ok ; if so, the flash is validated
- move.d [$r3+], $r2 ; partition length
-bosse: move.d [$r3+], $r5 ; checksum
- move.d [$r3+], $r4 ; type and flags
- addq 16, $r3 ; skip the reserved bytes
- btstq 16, $r4 ; check ro flag
- bpl ploop ; rw partition, skip validation
- nop
- btstq 17, $r4 ; check bootable flag
- bpl 1f
- nop
- move.d $r1, $r7 ; remember boot partition offset
-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.b 0x99, $r0
- move.b $r0, [SERBAUD] ; 115.2kbaud for both transmit and receive
-
- 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
-#ifdef CONFIG_ETRAX_PA_LEDS
- move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r2
-#endif
-#ifdef CONFIG_ETRAX_PB_LEDS
- move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r2
-#endif
- move.d (1 << CONFIG_ETRAX_LED1R) | (1 << CONFIG_ETRAX_LED2R), $r0
- btstq 16, $r1
- bpl 1f
- nop
- or.d $r0, $r2 ; set bit
- ba 2f
- nop
-1: not $r0 ; clear bit
- and.d $r0, $r2
-2:
-#ifdef CONFIG_ETRAX_PA_LEDS
- move.b $r2, [R_PORT_PA_DATA]
-#endif
-#ifdef CONFIG_ETRAX_PB_LEDS
- 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
- nop
-
- ;; got something - copy the byte and loop
-
- 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
- jump CODE_START
-
-flash_ok:
- ;; check r7, which contains either -1 or the partition to boot from
-
- cmp.d -1, $r7
- bne 1f
- 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
- jump $r7 ; boot!
-
-
- ;; Helper subroutines
-
- ;; Will checksum by simple addition
- ;; r1 - source
- ;; r2 - length in bytes
- ;; result will be in r0
-checksum:
- moveq 0, $r0
- moveq CONFIG_ETRAX_FLASH1_SIZE, $r6
-
- ;; If the first physical flash memory is exceeded wrap to the
- ;; second one
- btstq 26, $r1 ; Are we addressing first flash?
- bpl 1f
- nop
- clear.d $r6
-
-1: test.d $r6 ; 0 = no wrapping
- beq 2f
- nop
- lslq 20, $r6 ; Convert MB to bytes
- sub.d $r1, $r6
-
-2: addu.b [$r1+], $r0
- subq 1, $r6 ; Flash memory left
- beq 3f
- subq 1, $r2 ; Length left
- bne 2b
- nop
- ret
- nop
-
-3: move.d MEM_CSE1_START, $r1 ; wrap to second flash
- ba 2b
- nop
-
-#endif