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43 lines
1.4 KiB
ArmAsm
43 lines
1.4 KiB
ArmAsm
/*
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* Boot header to work around broken Allwinner A1x boot loaders
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*
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* Copyright (C) 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
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*
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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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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*
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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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*
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* This file is a workaround to broken bootloaders on Allwinner A1x
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* platform who do not provide correct machid or atags address
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*
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* Usage:
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* load the header at 0x40007000 and change the entry point of your
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* boot process to 0x40007000
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*
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* Detailed memory map:
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* 0x40000100 atags
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* 0x40007000 boot_head (entry point)
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* 0x40008000 kernel
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* 0x43000000 script.bin
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* If you have a ramdisk then load it at some higher address
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*/
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_start:
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ldr r0, =0
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ldr r1, =MACHID
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ldr r2, =0x40000100
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ldr lr, =0x40008000
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bx lr
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