090ab3ff8e
This allows a ROM-able zImage to be written to eSD and for SuperH Mobile ARM to boot directly from the SDHI hardware block. This is achieved by the MaskROM loading the first portion of the image into MERAM and then jumping to it. This portion contains loader code which copies the entire image to SDRAM and jumps to it. From there the zImage boot code proceeds as normal, uncompressing the image into its final location and then jumping to it. Cc: Paul Mundt <lethal@linux-sh.org> Acked-by: Magnus Damm <magnus.damm@gmail.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
83 lines
2.3 KiB
ArmAsm
83 lines
2.3 KiB
ArmAsm
/*
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* The head-file for SH-Mobile ARM platforms
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*
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* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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* Simon Horman <horms@verge.net.au>
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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 as published by
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* the Free Software Foundation; version 2 of the License.
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifdef CONFIG_ZBOOT_ROM
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.section ".start", "ax"
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/* load board-specific initialization code */
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#include <mach/zboot.h>
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#if defined(CONFIG_ZBOOT_ROM_MMCIF) || defined(CONFIG_ZBOOT_ROM_SH_MOBILE_SDHI)
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/* Load image from MMC/SD */
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adr sp, __tmp_stack + 256
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ldr r0, __image_start
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ldr r1, __image_end
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subs r1, r1, r0
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ldr r0, __load_base
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bl mmc_loader
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/* Jump to loaded code */
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ldr r0, __loaded
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ldr r1, __image_start
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sub r0, r0, r1
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ldr r1, __load_base
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add pc, r0, r1
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__image_start:
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.long _start
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__image_end:
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.long _got_end
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__load_base:
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.long CONFIG_MEMORY_START + 0x02000000 @ Load at 32Mb into SDRAM
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__loaded:
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.long __continue
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.align
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__tmp_stack:
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.space 256
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__continue:
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#endif /* CONFIG_ZBOOT_ROM_MMC || CONFIG_ZBOOT_ROM_SH_MOBILE_SDHI */
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b 1f
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__atags:@ tag #1
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.long 12 @ tag->hdr.size = tag_size(tag_core);
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.long 0x54410001 @ tag->hdr.tag = ATAG_CORE;
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.long 0 @ tag->u.core.flags = 0;
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.long 0 @ tag->u.core.pagesize = 0;
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.long 0 @ tag->u.core.rootdev = 0;
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@ tag #2
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.long 8 @ tag->hdr.size = tag_size(tag_mem32);
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.long 0x54410002 @ tag->hdr.tag = ATAG_MEM;
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.long CONFIG_MEMORY_SIZE @ tag->u.mem.size = CONFIG_MEMORY_SIZE;
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.long CONFIG_MEMORY_START @ @ tag->u.mem.start = CONFIG_MEMORY_START;
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@ tag #3
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.long 0 @ tag->hdr.size = 0
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.long 0 @ tag->hdr.tag = ATAG_NONE;
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1:
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/* Set board ID necessary for boot */
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ldr r7, 1f @ Set machine type register
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adr r8, __atags @ Set atag register
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b 2f
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1 : .long MACH_TYPE
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2 :
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#endif /* CONFIG_ZBOOT_ROM */
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