| /* |
| 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 |