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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/firmware/av7110/Boot.S
10821 views
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/*

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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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		                 <[email protected]>

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   Copyright (C) 2006 Matthieu CASTET <[email protected]>

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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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