358 lines
9.4 KiB
ArmAsm
358 lines
9.4 KiB
ArmAsm
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/*
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* Rescue code, made to reside at the beginning of the
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* flash-memory. when it starts, it checks a partition
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* table at the first sector after the rescue sector.
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* the partition table was generated by the product builder
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* script and contains offsets, lengths, types and checksums
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* for each partition that this code should check.
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*
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* If any of the checksums fail, we assume the flash is so
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* corrupt that we can't use it to boot into the ftp flash
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* loader, and instead we initialize the serial port to
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* receive a flash-loader and new flash image. we dont include
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* any flash code here, but just accept a certain amount of
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* bytes from the serial port and jump into it. the downloaded
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* code is put in the cache.
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*
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* The partitiontable is designed so that it is transparent to
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* code execution - it has a relative branch opcode in the
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* beginning that jumps over it. each entry contains extra
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* data so we can add stuff later.
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*
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* Partition table format:
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*
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* Code transparency:
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*
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* 2 bytes [opcode 'nop']
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* 2 bytes [opcode 'di']
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* 4 bytes [opcode 'ba <offset>', 8-bit or 16-bit version]
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* 2 bytes [opcode 'nop', delay slot]
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*
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* Table validation (at +10):
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*
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* 2 bytes [magic/version word for partitiontable - 0xef, 0xbe]
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* 2 bytes [length of all entries plus the end marker]
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* 4 bytes [checksum for the partitiontable itself]
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*
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* Entries, each with the following format, last has offset -1:
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*
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* 4 bytes [offset in bytes, from start of flash]
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* 4 bytes [length in bytes of partition]
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* 4 bytes [checksum, simple longword sum]
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* 2 bytes [partition type]
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* 2 bytes [flags, only bit 0 used, ro/rw = 1/0]
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* 16 bytes [reserved for future use]
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*
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* End marker
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*
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* 4 bytes [-1]
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*
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* 10 bytes [0, padding]
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*
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* Bit 0 in flags signifies RW or RO. The rescue code only bothers
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* to check the checksum for RO partitions, since the others will
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* change their data without updating the checksums. A 1 in bit 0
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* means RO, 0 means RW. That way, it is possible to set a partition
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* in RO mode initially, and later mark it as RW, since you can always
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* write 0's to the flash.
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*
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* During the wait for serial input, the status LED will flash so the
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* user knows something went wrong.
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*
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* Copyright (C) 1999-2007 Axis Communications AB
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*/
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#ifdef CONFIG_ETRAX_AXISFLASHMAP
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#define ASSEMBLER_MACROS_ONLY
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#include <arch/sv_addr_ag.h>
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;; The partitiontable is looked for at the first sector after the boot
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;; sector. Sector size is 65536 bytes in all flashes we use.
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#define PTABLE_START CONFIG_ETRAX_PTABLE_SECTOR
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#define PTABLE_MAGIC 0xbeef
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;; The normal Etrax100 on-chip boot ROM does serial boot at 0x380000f0.
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;; That is not where we put our downloaded serial boot-code.
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;; The length is enough for downloading code that loads the rest
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;; of itself (after having setup the DRAM etc).
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;; It is the same length as the on-chip ROM loads, so the same
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;; host loader can be used to load a rescued product as well as
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;; one booted through the Etrax serial boot code.
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#define CODE_START 0x40000000
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#define CODE_LENGTH 784
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#ifdef CONFIG_ETRAX_RESCUE_SER0
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#define SERXOFF R_SERIAL0_XOFF
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#define SERBAUD R_SERIAL0_BAUD
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#define SERRECC R_SERIAL0_REC_CTRL
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#define SERRDAT R_SERIAL0_REC_DATA
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#define SERSTAT R_SERIAL0_STATUS
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#endif
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#ifdef CONFIG_ETRAX_RESCUE_SER1
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#define SERXOFF R_SERIAL1_XOFF
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#define SERBAUD R_SERIAL1_BAUD
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#define SERRECC R_SERIAL1_REC_CTRL
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#define SERRDAT R_SERIAL1_REC_DATA
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#define SERSTAT R_SERIAL1_STATUS
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#endif
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#ifdef CONFIG_ETRAX_RESCUE_SER2
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#define SERXOFF R_SERIAL2_XOFF
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#define SERBAUD R_SERIAL2_BAUD
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#define SERRECC R_SERIAL2_REC_CTRL
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#define SERRDAT R_SERIAL2_REC_DATA
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#define SERSTAT R_SERIAL2_STATUS
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#endif
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#ifdef CONFIG_ETRAX_RESCUE_SER3
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#define SERXOFF R_SERIAL3_XOFF
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#define SERBAUD R_SERIAL3_BAUD
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#define SERRECC R_SERIAL3_REC_CTRL
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#define SERRDAT R_SERIAL3_REC_DATA
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#define SERSTAT R_SERIAL3_STATUS
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#endif
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#define NOP_DI 0xf025050f
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#define RAM_INIT_MAGIC 0x56902387
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.text
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;; This is the entry point of the rescue code
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;; 0x80000000 if loaded in flash (as it should be)
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;; Since etrax actually starts at address 2 when booting from flash, we
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;; put a nop (2 bytes) here first so we dont accidentally skip the di
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nop
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di
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jump in_cache ; enter cached area instead
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in_cache:
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;; First put a jump test to give a possibility of upgrading the
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;; rescue code without erasing/reflashing the sector.
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;; We put a longword of -1 here and if it is not -1, we jump using
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;; the value as jump target. Since we can always change 1's to 0's
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;; without erasing the sector, it is possible to add new
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;; code after this and altering the jumptarget in an upgrade.
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jtcd: move.d [jumptarget], $r0
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cmp.d 0xffffffff, $r0
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beq no_newjump
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nop
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jump [$r0]
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jumptarget:
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.dword 0xffffffff ; can be overwritten later to insert new code
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no_newjump:
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#ifdef CONFIG_ETRAX_ETHERNET
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;; Start MII clock to make sure it is running when tranceiver is reset
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move.d 0x3, $r0 ; enable = on, phy = mii_clk
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move.d $r0, [R_NETWORK_GEN_CONFIG]
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#endif
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;; We need to setup the bus registers before we start using the DRAM
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#include "../../../arch-v10/lib/dram_init.S"
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;; we now should go through the checksum-table and check the listed
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;; partitions for errors.
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move.d PTABLE_START, $r3
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move.d [$r3], $r0
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cmp.d NOP_DI, $r0 ; make sure the nop/di is there...
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bne do_rescue
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nop
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;; skip the code transparency block (10 bytes).
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addq 10, $r3
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;; check for correct magic
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move.w [$r3+], $r0
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cmp.w PTABLE_MAGIC, $r0
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bne do_rescue ; didn't recognize - trig rescue
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nop
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;; check for correct ptable checksum
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movu.w [$r3+], $r2 ; ptable length
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move.d $r2, $r8 ; save for later, length of total ptable
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addq 28, $r8 ; account for the rest
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move.d [$r3+], $r4 ; ptable checksum
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move.d $r3, $r1
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jsr checksum ; r1 source, r2 length, returns in r0
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cmp.d $r0, $r4
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bne do_rescue ; didn't match - trig rescue
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nop
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;; ptable is ok. validate each entry.
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moveq -1, $r7
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ploop: move.d [$r3+], $r1 ; partition offset (from ptable start)
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bne notfirst ; check if it is the partition containing ptable
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nop ; yes..
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move.d $r8, $r1 ; for its checksum check, skip the ptable
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move.d [$r3+], $r2 ; partition length
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sub.d $r8, $r2 ; minus the ptable length
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ba bosse
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nop
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notfirst:
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cmp.d -1, $r1 ; the end of the ptable ?
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beq flash_ok ; if so, the flash is validated
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move.d [$r3+], $r2 ; partition length
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bosse: move.d [$r3+], $r5 ; checksum
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move.d [$r3+], $r4 ; type and flags
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addq 16, $r3 ; skip the reserved bytes
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btstq 16, $r4 ; check ro flag
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bpl ploop ; rw partition, skip validation
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nop
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btstq 17, $r4 ; check bootable flag
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bpl 1f
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nop
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move.d $r1, $r7 ; remember boot partition offset
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1:
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add.d PTABLE_START, $r1
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jsr checksum ; checksum the partition
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cmp.d $r0, $r5
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beq ploop ; checksums matched, go to next entry
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nop
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;; otherwise fall through to the rescue code.
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do_rescue:
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;; setup port PA and PB default initial directions and data
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;; (so we can flash LEDs, and so that DTR and others are set)
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move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR, $r0
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move.b $r0, [R_PORT_PA_DIR]
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move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r0
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move.b $r0, [R_PORT_PA_DATA]
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move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR, $r0
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move.b $r0, [R_PORT_PB_DIR]
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move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r0
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move.b $r0, [R_PORT_PB_DATA]
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;; setup the serial port at 115200 baud
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moveq 0, $r0
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move.d $r0, [SERXOFF]
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move.b 0x99, $r0
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move.b $r0, [SERBAUD] ; 115.2kbaud for both transmit and receive
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move.b 0x40, $r0 ; rec enable
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move.b $r0, [SERRECC]
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moveq 0, $r1 ; "timer" to clock out a LED red flash
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move.d CODE_START, $r3 ; destination counter
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movu.w CODE_LENGTH, $r4; length
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wait_ser:
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addq 1, $r1
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#ifndef CONFIG_ETRAX_NO_LEDS
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#ifdef CONFIG_ETRAX_PA_LEDS
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move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r2
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#endif
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#ifdef CONFIG_ETRAX_PB_LEDS
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move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r2
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#endif
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move.d (1 << CONFIG_ETRAX_LED1R) | (1 << CONFIG_ETRAX_LED2R), $r0
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btstq 16, $r1
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bpl 1f
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nop
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or.d $r0, $r2 ; set bit
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ba 2f
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nop
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1: not $r0 ; clear bit
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and.d $r0, $r2
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2:
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#ifdef CONFIG_ETRAX_PA_LEDS
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move.b $r2, [R_PORT_PA_DATA]
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#endif
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#ifdef CONFIG_ETRAX_PB_LEDS
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move.b $r2, [R_PORT_PB_DATA]
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#endif
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#endif
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;; check if we got something on the serial port
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move.b [SERSTAT], $r0
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btstq 0, $r0 ; data_avail
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bpl wait_ser
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nop
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;; got something - copy the byte and loop
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move.b [SERRDAT], $r0
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move.b $r0, [$r3+]
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subq 1, $r4 ; decrease length
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bne wait_ser
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nop
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;; jump into downloaded code
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move.d RAM_INIT_MAGIC, $r8 ; Tell next product that DRAM is
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; initialized
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jump CODE_START
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flash_ok:
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;; check r7, which contains either -1 or the partition to boot from
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cmp.d -1, $r7
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bne 1f
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nop
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move.d PTABLE_START, $r7; otherwise use the ptable start
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1:
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move.d RAM_INIT_MAGIC, $r8 ; Tell next product that DRAM is
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; initialized
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jump $r7 ; boot!
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;; Helper subroutines
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;; Will checksum by simple addition
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;; r1 - source
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;; r2 - length in bytes
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;; result will be in r0
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checksum:
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moveq 0, $r0
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moveq CONFIG_ETRAX_FLASH1_SIZE, $r6
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;; If the first physical flash memory is exceeded wrap to the
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;; second one
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btstq 26, $r1 ; Are we addressing first flash?
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bpl 1f
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nop
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clear.d $r6
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1: test.d $r6 ; 0 = no wrapping
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beq 2f
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nop
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lslq 20, $r6 ; Convert MB to bytes
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sub.d $r1, $r6
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2: addu.b [$r1+], $r0
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subq 1, $r6 ; Flash memory left
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beq 3f
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subq 1, $r2 ; Length left
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bne 2b
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nop
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ret
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nop
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3: move.d MEM_CSE1_START, $r1 ; wrap to second flash
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ba 2b
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nop
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#endif
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