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5f97f7f940
This adds support for the Atmel AVR32 architecture as well as the AT32AP7000 CPU and the AT32STK1000 development board. AVR32 is a new high-performance 32-bit RISC microprocessor core, designed for cost-sensitive embedded applications, with particular emphasis on low power consumption and high code density. The AVR32 architecture is not binary compatible with earlier 8-bit AVR architectures. The AVR32 architecture, including the instruction set, is described by the AVR32 Architecture Manual, available from http://www.atmel.com/dyn/resources/prod_documents/doc32000.pdf The Atmel AT32AP7000 is the first CPU implementing the AVR32 architecture. It features a 7-stage pipeline, 16KB instruction and data caches and a full Memory Management Unit. It also comes with a large set of integrated peripherals, many of which are shared with the AT91 ARM-based controllers from Atmel. Full data sheet is available from http://www.atmel.com/dyn/resources/prod_documents/doc32003.pdf while the CPU core implementation including caches and MMU is documented by the AVR32 AP Technical Reference, available from http://www.atmel.com/dyn/resources/prod_documents/doc32001.pdf Information about the AT32STK1000 development board can be found at http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3918 including a BSP CD image with an earlier version of this patch, development tools (binaries and source/patches) and a root filesystem image suitable for booting from SD card. Alternatively, there's a preliminary "getting started" guide available at http://avr32linux.org/twiki/bin/view/Main/GettingStarted which provides links to the sources and patches you will need in order to set up a cross-compiling environment for avr32-linux. This patch, as well as the other patches included with the BSP and the toolchain patches, is actively supported by Atmel Corporation. [dmccr@us.ibm.com: Fix more pxx_page macro locations] [bunk@stusta.de: fix `make defconfig'] Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Dave McCracken <dmccr@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
61 lines
1.3 KiB
ArmAsm
61 lines
1.3 KiB
ArmAsm
/*
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* Startup code for use with the u-boot bootloader.
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*
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/setup.h>
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/*
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* The kernel is loaded where we want it to be and all caches
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* have just been flushed. We get two parameters from u-boot:
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*
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* r12 contains a magic number (ATAG_MAGIC)
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* r11 points to a tag table providing information about
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* the system.
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*/
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.section .init.text,"ax"
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.global _start
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_start:
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/* Check if the boot loader actually provided a tag table */
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lddpc r0, magic_number
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cp.w r12, r0
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brne no_tag_table
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/* Initialize .bss */
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lddpc r2, bss_start_addr
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lddpc r3, end_addr
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mov r0, 0
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mov r1, 0
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1: st.d r2++, r0
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cp r2, r3
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brlo 1b
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/*
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* Save the tag table address for later use. This must be done
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* _after_ .bss has been initialized...
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*/
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lddpc r0, tag_table_addr
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st.w r0[0], r11
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/* Jump to loader-independent setup code */
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rjmp kernel_entry
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.align 2
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magic_number:
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.long ATAG_MAGIC
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tag_table_addr:
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.long bootloader_tags
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bss_start_addr:
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.long __bss_start
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end_addr:
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.long _end
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no_tag_table:
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sub r12, pc, (. - 2f)
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bral panic
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2: .asciz "Boot loader didn't provide correct magic number\n"
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