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