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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 23:30:55 +07:00
2c408d1492
Instead of relying of MACH_TYPE for board identification,
update the romImage code to relocate an appended DTB to
the beginning of RAM. This implementation is independent
of ARM_APPENDED_DTB, this because it is necessary to copy
the DTB to memory so the kernel can access it.
Without this patch Mackerel does not boot via the Mask ROM
over USB (r_usb_boot) - this since non-DT boot was broken
ages ago in commit:
0ce53cd ARM: mach-shmobile: Use DT_MACHINE for mackerel
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
102 lines
2.4 KiB
ArmAsm
102 lines
2.4 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 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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adr r0, dtb_info
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ldmia r0, {r1, r3, r4, r5, r7}
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sub r0, r0, r1 @ calculate the delta offset
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add r5, r5, r0 @ _edata
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ldr lr, [r5, #0] @ check if valid DTB is present
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cmp lr, r3
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bne 0f
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add r9, r7, #31 @ rounded up to a multiple
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bic r9, r9, #31 @ ... of 32 bytes
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add r6, r9, r5 @ copy from _edata
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add r9, r9, r4 @ to MEMORY_START
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1: ldmdb r6!, {r0 - r3, r10 - r12, lr}
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cmp r6, r5
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stmdb r9!, {r0 - r3, r10 - r12, lr}
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bhi 1b
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/* Success: Zero board ID, pointer to start of memory for atag/dtb */
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mov r7, #0
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mov r8, r4
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b 2f
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.align 2
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dtb_info:
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.word dtb_info
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#ifndef __ARMEB__
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.word 0xedfe0dd0 @ sig is 0xd00dfeed big endian
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#else
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.word 0xd00dfeed
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#endif
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.word MEMORY_START
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.word _edata
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.word 0x4000 @ maximum DTB size
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0:
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/* Failure: Zero board ID, NULL atag/dtb */
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mov r7, #0
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mov r8, #0 @ pass null pointer as atag
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2 :
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#endif /* CONFIG_ZBOOT_ROM */
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