Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 333 insertions, 0 deletions

diff --git a/arch/cris/arch-v10/boot/rescue/head.S b/arch/cris/arch-v10/boot/rescue/head.S
new file mode 100644
index 000000000000..8689ea972c46
--- /dev/null
+++ b/arch/cris/arch-v10/boot/rescue/head.S
@@ -0,0 +1,333 @@
+/* $Id: head.S,v 1.6 2003/04/09 08:12:43 pkj 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.
+ * 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, 2000, 2001, 2002, 2003 Axis Communications AB
+ */
+
+#include <linux/config.h>
+#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
+
+        ;; 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, $r0
+1:      addu.b  [$r1+], $r0
+        subq    1, $r2
+        bne     1b
+        nop
+        ret
+        nop