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-/*
- Boot.S: boot loader for Siemens DVB-S card
-
- Copyright (C) 2001 Convergence integrated media GmbH
- Written by Ralph Metzler
- <rjkm@convergence.de>
- Copyright (C) 2006 Matthieu CASTET <castet.mattheiu@free.fr>
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-
-*/
-
-/*
- check AV711x_3_1.pdf for some hardware infos
- build it with :
- $ cc -mbig-endian -c Boot.S
- $ ld -Ttext 0x2c000000 -EB -o Boot Boot.o
- $ objcopy -Obinary Boot
-*/
-
- .text
- .align
- .globl _start
-_start:
- b reset // reset vector
- movs pc, r14 // undefined
- subs pc, r14, #4 // SWI
- subs pc, r14, #4 // prefetch abort
- subs pc, r14, #8 // data abort
- subs pc, r14, #4 // reserved
- subs pc, r14, #4 // IRQ
- subs pc, r14, #4 // FIQ
-
- .word tbl // table needed by firmware ROM
-tbl: .word (endtbl - tbl)
- .word 0
- .word conf
-endtbl: .word 0
-conf: .word 0xa5a55a5a
- .word 0x001f1555
- .word 0x00000009
-
-reset: ldr r13, buffer
- ldr r4, flag
- mov r0, #0
- str r0, [r4]
- str r0, [r4, #4]
-
- ldr r1, wait_address
- ldr r2, flag_address
- ldr r3, sram
-
-copycode: // copy the code HW Sram
- ldmia r1!, {r5-r12}
- stmia r3!, {r5-r12}
- cmp r1, r2
- ble copycode
- ldr pc, sram // jump to the copied code
-
-wait: ldrh r1, [r4] // wait for flag!=0
- cmp r1, #0
- beq wait
-
- mov r1, r13 // buffer address
- ldr r3, [r4,#4] // destaddr
-
- ldrh r2, [r4,#2] // get segment length
- add r2, r2, #63 // round length to next 64 bytes
- movs r2, r2, lsr #6 // and divide by 64
- moveq r0, #2 // if 0, set flag to 2, else signal
- strh r0, [r4] // that buffer is accepted by setting to 0
- beq wait
-
-copyloop:
- ldmia r1!, {r5-r12}
- stmia r3!, {r5-r12}
- ldmia r1!, {r5-r12}
- stmia r3!, {r5-r12}
- subs r2, r2, #1
- bne copyloop
-
- eor r13, r13, #0x1400 // switch to other buffer
- b wait
-
-// flag is stored at 0x2c0003f8, length at 0x2c0003fa,
-// destaddr at 0x2c0003fc
-
-flag: .word 0x2c0003f8
-
-
-// buffer 1 is at 0x2c000400, buffer 2 at 0x2c001000
-
-buffer: .word 0x2c000400
-
-sram: .word 0x9e000800
-wait_address: .word wait
-flag_address: .word flag
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