我不太会集会。
我有一个基于 i.mx6qp 的板，它正在检查flash_header.S中的不同点。
我想将所有这些更改都移植到较新的 mx6_plugin.S 文件中，但是我对此很难理解，
这是文件 mx6_plugin.S
/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#ifdef CONFIG_ROM_UNIFIED_SECTIONS
#define ROM_API_TABLE_BASE_ADDR_LEGACY 0x180
#define ROM_VERSION_OFFSET 0x80
#else
#define ROM_API_TABLE_BASE_ADDR_LEGACY 0xC0
#define ROM_VERSION_OFFSET 0x48
#endif
#define ROM_API_TABLE_BASE_ADDR_MX6DQ_TO15 0xC4
#define ROM_API_TABLE_BASE_ADDR_MX6DL_TO12 0xC4
#define ROM_API_HWCNFG_SETUP_OFFSET 0x08
#define ROM_VERSION_TO10 0x10
#define ROM_VERSION_TO12 0x12
#define ROM_VERSION_TO15 0x15
plugin_start:
push {r0-r4, lr}
imx6_ddr_setting
imx6_clock_gating
imx6_qos_setting
/*
* The following is to fill in those arguments for this ROM function
* pu_irom_hwcnfg_setup(void **start, size_t *bytes, const void *boot_data)
* This function is used to copy data from the storage media into DDR.
* start - Initial (possibly partial) image load address on entry.
* Final image load address on exit.
* bytes - Initial (possibly partial) image size on entry.
* Final image size on exit.
* boot_data - Initial @ref ivt Boot Data load address.
*/
adr r0, boot_data2
adr r1, image_len2
adr r2, boot_data2
#ifdef CONFIG_NOR_BOOT
#ifdef CONFIG_MX6SX
ldr r3, =ROM_VERSION_OFFSET
ldr r4, [r3]
cmp r4, #ROM_VERSION_TO10
bgt before_calling_rom___pu_irom_hwcnfg_setup
ldr r3, =0x00900b00
ldr r4, =0x50000000
str r4, [r3, #0x5c]
#else
ldr r3, =0x00900800
ldr r4, =0x08000000
str r4, [r3, #0xc0]
#endif
#endif
/*
* check the _pu_irom_api_table for the address
*/
before_calling_rom___pu_irom_hwcnfg_setup:
ldr r3, =ROM_VERSION_OFFSET
ldr r4, [r3]
#if defined(CONFIG_MX6S) || defined(CONFIG_MX6DL)
ldr r3, =ROM_VERSION_TO12
cmp r4, r3
ldrge r3, =ROM_API_TABLE_BASE_ADDR_MX6DL_TO12
ldrlt r3, =ROM_API_TABLE_BASE_ADDR_LEGACY
#elif defined(CONFIG_MX6Q)
ldr r3, =ROM_VERSION_TO15
cmp r4, r3
ldrge r3, =ROM_API_TABLE_BASE_ADDR_MX6DQ_TO15
ldrlt r3, =ROM_API_TABLE_BASE_ADDR_LEGACY
#else
ldr r3, =ROM_API_TABLE_BASE_ADDR_LEGACY
#endif
ldr r4, [r3, #ROM_API_HWCNFG_SETUP_OFFSET]
blx r4
after_calling_rom___pu_irom_hwcnfg_setup:
/*
* ROM_API_HWCNFG_SETUP function enables MMU & Caches.
* Thus disable MMU & Caches.
*/
mrc p15, 0, r0, c1, c0, 0 /* read CP15 register 1 into r0*/
ands r0, r0, #0x1 /* check if MMU is enabled */
beq mmu_disable_notreq /* exit if MMU is already disabled */
/* Disable caches, MMU */
mrc p15, 0, r0, c1, c0, 0 /* read CP15 register 1 into r0 */
bic r0, r0, #(1 << 2) /* disable D Cache */
bic r0, r0, #0x1 /* clear bit 0 ; MMU off */
bic r0, r0, #(0x1 << 11) /* disable Z, branch prediction */
bic r0, r0, #(0x1 << 1) /* disable A, Strict alignment */
/* check enabled. */
mcr p15, 0, r0, c1, c0, 0 /* write CP15 register 1 */
mov r0, r0
mov r0, r0
mov r0, r0
mov r0, r0
mmu_disable_notreq:
NOP
/* To return to ROM from plugin, we need to fill in these argument.
* Here is what need to do:
* Need to construct the paramters for this function before return to ROM:
* plugin_download(void **start, size_t *bytes, UINT32 *ivt_offset)
*/
pop {r0-r4, lr}
push {r5}
ldr r5, boot_data2
str r5, [r0]
ldr r5, image_len2
str r5, [r1]
ldr r5, second_ivt_offset
str r5, [r2]
mov r0, #1
pop {r5}
/* return back to ROM code */
bx lr
/* make the following data right in the end of the output*/
.ltorg
#if (defined(CONFIG_NOR_BOOT) || defined(CONFIG_QSPI_BOOT))
#define FLASH_OFFSET 0x1000
#else
#define FLASH_OFFSET 0x400
#endif
/*
* second_ivt_offset is the offset from the "second_ivt_header" to
* "image_copy_start", which involves FLASH_OFFSET, plus the first
* ivt_header, the plugin code size itself recorded by "ivt2_header"
*/
second_ivt_offset: .long (ivt2_header + 0x2C + FLASH_OFFSET)
/*
* The following is the second IVT header plus the second boot data
*/
ivt2_header: .long 0x0
app2_code_jump_v: .long 0x0
reserv3: .long 0x0
dcd2_ptr: .long 0x0
boot_data2_ptr: .long 0x0
self_ptr2: .long 0x0
app_code_csf2: .long 0x0
reserv4: .long 0x0
boot_data2: .long 0x0
image_len2: .long 0x0
plugin2: .long 0x0
较早的代码保存了OCRAM的某些部分，以保持结果。以同样的方式，我只是在插件启动上方添加了这段代码，
HWID_SAMPLE_DEBUG:
.space 16, 0x55
plugin_start:
...
使用标签上方的标签会使sabresd插件启动停止。
此更改的作用是使sabresd插件映像停止工作，仅保存16个位置？我在哪里可以放这样的代码？
如果我不能使用此方法，那么还有其他方法可以将wids保存在OCRAM中吗？