| Jaswinder Singh | 9137f05 | 2009-04-06 14:34:12 -0700 | [diff] [blame] | 1 | /* |
| 2 | Boot.S: boot loader for Siemens DVB-S card |
| 3 | |
| 4 | Copyright (C) 2001 Convergence integrated media GmbH |
| 5 | Written by Ralph Metzler |
| 6 | <rjkm@convergence.de> |
| 7 | Copyright (C) 2006 Matthieu CASTET <castet.mattheiu@free.fr> |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or |
| 10 | modify it under the terms of the GNU General Public License |
| 11 | as published by the Free Software Foundation; either version 2 |
| 12 | of the License, or (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | |
| 23 | */ |
| 24 | |
| 25 | /* |
| 26 | check AV711x_3_1.pdf for some hardware infos |
| 27 | build it with : |
| 28 | $ cc -mbig-endian -c Boot.S |
| 29 | $ ld -Ttext 0x2c000000 -EB -o Boot Boot.o |
| 30 | $ objcopy -Obinary Boot |
| 31 | */ |
| 32 | |
| 33 | .text |
| 34 | .align |
| 35 | .globl _start |
| 36 | _start: |
| 37 | b reset // reset vector |
| 38 | movs pc, r14 // undefined |
| 39 | subs pc, r14, #4 // SWI |
| 40 | subs pc, r14, #4 // prefetch abort |
| 41 | subs pc, r14, #8 // data abort |
| 42 | subs pc, r14, #4 // reserved |
| 43 | subs pc, r14, #4 // IRQ |
| 44 | subs pc, r14, #4 // FIQ |
| 45 | |
| 46 | .word tbl // table needed by firmware ROM |
| 47 | tbl: .word (endtbl - tbl) |
| 48 | .word 0 |
| 49 | .word conf |
| 50 | endtbl: .word 0 |
| 51 | conf: .word 0xa5a55a5a |
| 52 | .word 0x001f1555 |
| 53 | .word 0x00000009 |
| 54 | |
| 55 | reset: ldr r13, buffer |
| 56 | ldr r4, flag |
| 57 | mov r0, #0 |
| 58 | str r0, [r4] |
| 59 | str r0, [r4, #4] |
| 60 | |
| 61 | ldr r1, wait_address |
| 62 | ldr r2, flag_address |
| 63 | ldr r3, sram |
| 64 | |
| 65 | copycode: // copy the code HW Sram |
| 66 | ldmia r1!, {r5-r12} |
| 67 | stmia r3!, {r5-r12} |
| 68 | cmp r1, r2 |
| 69 | ble copycode |
| 70 | ldr pc, sram // jump to the copied code |
| 71 | |
| 72 | wait: ldrh r1, [r4] // wait for flag!=0 |
| 73 | cmp r1, #0 |
| 74 | beq wait |
| 75 | |
| 76 | mov r1, r13 // buffer address |
| 77 | ldr r3, [r4,#4] // destaddr |
| 78 | |
| 79 | ldrh r2, [r4,#2] // get segment length |
| 80 | add r2, r2, #63 // round length to next 64 bytes |
| 81 | movs r2, r2, lsr #6 // and divide by 64 |
| 82 | moveq r0, #2 // if 0, set flag to 2, else signal |
| 83 | strh r0, [r4] // that buffer is accepted by setting to 0 |
| 84 | beq wait |
| 85 | |
| 86 | copyloop: |
| 87 | ldmia r1!, {r5-r12} |
| 88 | stmia r3!, {r5-r12} |
| 89 | ldmia r1!, {r5-r12} |
| 90 | stmia r3!, {r5-r12} |
| 91 | subs r2, r2, #1 |
| 92 | bne copyloop |
| 93 | |
| 94 | eor r13, r13, #0x1400 // switch to other buffer |
| 95 | b wait |
| 96 | |
| 97 | // flag is stored at 0x2c0003f8, length at 0x2c0003fa, |
| 98 | // destaddr at 0x2c0003fc |
| 99 | |
| 100 | flag: .word 0x2c0003f8 |
| 101 | |
| 102 | |
| 103 | // buffer 1 is at 0x2c000400, buffer 2 at 0x2c001000 |
| 104 | |
| 105 | buffer: .word 0x2c000400 |
| 106 | |
| 107 | sram: .word 0x9e000800 |
| 108 | wait_address: .word wait |
| 109 | flag_address: .word flag |