linux/arch/arm/boot/compressed/head-shmobile.S
Simon Horman 090ab3ff8e ARM: 6886/1: mmc, Add zboot from eSD support for SuperH Mobile ARM
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>
2011-06-29 10:00:52 +01:00

84 lines
2.3 KiB
ArmAsm

/*
* The head-file for SH-Mobile ARM platforms
*
* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
* Simon Horman <horms@verge.net.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef CONFIG_ZBOOT_ROM
.section ".start", "ax"
/* load board-specific initialization code */
#include <mach/zboot.h>
#if defined(CONFIG_ZBOOT_ROM_MMCIF) || defined(CONFIG_ZBOOT_ROM_SH_MOBILE_SDHI)
/* Load image from MMC/SD */
adr sp, __tmp_stack + 256
ldr r0, __image_start
ldr r1, __image_end
subs r1, r1, r0
ldr r0, __load_base
bl mmc_loader
/* Jump to loaded code */
ldr r0, __loaded
ldr r1, __image_start
sub r0, r0, r1
ldr r1, __load_base
add pc, r0, r1
__image_start:
.long _start
__image_end:
.long _got_end
__load_base:
.long CONFIG_MEMORY_START + 0x02000000 @ Load at 32Mb into SDRAM
__loaded:
.long __continue
.align
__tmp_stack:
.space 256
__continue:
#endif /* CONFIG_ZBOOT_ROM_MMC || CONFIG_ZBOOT_ROM_SH_MOBILE_SDHI */
b 1f
__atags:@ tag #1
.long 12 @ tag->hdr.size = tag_size(tag_core);
.long 0x54410001 @ tag->hdr.tag = ATAG_CORE;
.long 0 @ tag->u.core.flags = 0;
.long 0 @ tag->u.core.pagesize = 0;
.long 0 @ tag->u.core.rootdev = 0;
@ tag #2
.long 8 @ tag->hdr.size = tag_size(tag_mem32);
.long 0x54410002 @ tag->hdr.tag = ATAG_MEM;
.long CONFIG_MEMORY_SIZE @ tag->u.mem.size = CONFIG_MEMORY_SIZE;
.long CONFIG_MEMORY_START @ @ tag->u.mem.start = CONFIG_MEMORY_START;
@ tag #3
.long 0 @ tag->hdr.size = 0
.long 0 @ tag->hdr.tag = ATAG_NONE;
1:
/* Set board ID necessary for boot */
ldr r7, 1f @ Set machine type register
adr r8, __atags @ Set atag register
b 2f
1 : .long MACH_TYPE
2 :
#endif /* CONFIG_ZBOOT_ROM */