forked from Minki/linux
f45b114991
This allows a ROM-able zImage to be written to MMC and for SuperH Mobile ARM to boot directly from the MMCIF 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: Magnus Damm <magnus.damm@gmail.com> Russell, please consider merging this for 2.6.38. This patch depends on: * "mmc, sh: Move MMCIF_PROGRESS_* into sh_mmcif.h" which will be merged though Paul Mundt's rmobile sh-2.6. The absence of this patch will break the build if the (new) CONFIG_ZBOOT_ROM_MMCIF option is set. There are no subtle side-effects. v2: Addressed comments by Magnus Damm * Fix copyright in vrl4.c * Fix use of #define CONFIG_ZBOOT_ROM_MMCIF in mmcif-sh7372.c * Initialise LED GPIO lines in head-ap4evb.txt instead of mmcif-sh7372.c as this is considered board-specific. v3: Addressed comments made in person by Magnus Damm * Move mmcif_loader to be earlier in the image and reduce the number of blocks of boot program loaded by the MaskRom from 40 to 8 accordingly. * Move LED GPIO initialisation into mmcif_progress_init - This leaves the partner jet script unbloated Other * inline mmcif_update_progress so it is a static inline in a header file v4: * Use htole16() and htole32() in v4rl.c to ensure that the output is little endian v5: Addressed comments by Russell King * Simplify assembly code * Jump to code rather than an address <- bug fix * Use (void __iomem *) as appropriate Roll in mackerel support * This was previously a separate patch, only because of the order in which this code was developed Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
84 lines
2.2 KiB
ArmAsm
84 lines
2.2 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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#ifdef CONFIG_ZBOOT_ROM_MMCIF
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/* Load image from MMC */
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adr sp, __tmp_stack + 128
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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 mmcif_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 128
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__continue:
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#endif /* CONFIG_ZBOOT_ROM_MMCIF */
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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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