\u8bbe\u5907\u6811\u7684\u4f20\u9012<\/strong><\/div>\n
\u5f53\u4f7f\u7528 bootm \u52a0\u8f7d kernel \u955c\u50cf\u65f6\uff08bootz \u662f\u5bf9 bootm \u7684\u4e00\u79cd\u5c01\u88c5\u4ee5\u53ca\u529f\u80fd\u6269\u5c55\uff0c\u5b9e\u8d28\u4e00\u6837\uff09\u3002U-Boot \u8df3\u8f6c\u5230 kernel \u7684\u5165\u53e3\u51fd\u6570\u662f boot_jump_linux<\/p>\n
\u8fd9\u4e2a\u51fd\u6570\u7684 C \u6587\u4ef6\u5728 arch\/arm\/lib \u4e0b\uff0c\u8bf4\u660e\u8bbe\u5907\u6811\u7684\u4f20\u9012\u7684\u65b9\u5f0f\u662f\u4e0e SoC \u67b6\u6784\u76f8\u5173\u7684\u3002\u4e0d\u540c\u7684 SoC \u5728 bring-up \u65f6\uff0c\u8fd9\u4e2a\u51fd\u6570\u683c\u5916\u91cd\u8981\uff0c\u8fd9\u662f U-Boot \u4e0e kernel \u4e4b\u95f4\u8854\u63a5\u3001\u4ea4\u4e92\u4fe1\u606f\u7684\u4e00\u4e2a\u5173\u952e API\u3002U-Boot \u7684\u8fd9\u4e2a\u51fd\u6570\u6267\u884c\u7ed3\u675f\u540e\uff0c\u5c06 CPU \u7684\u63a7\u5236\u6743\u5b8c\u6574\u7684\u4ea4\u7ed9 kernel\u3002<\/p>\n
\/*\u00a0Subcommand:\u00a0GO\u00a0*\/\r\nstatic\u00a0void\u00a0boot_jump_linux(bootm_headers_t\u00a0*images,\u00a0int\u00a0flag)\r\n{\r\n...\r\n\u00a0\u00a0debug(\"##\u00a0Transferring\u00a0control\u00a0to\u00a0Linux\u00a0(at\u00a0address\u00a0%08lx)\"\u00a0\\\r\n\u00a0\u00a0\u00a0\u00a0\"...\\n\",\u00a0(ulong)\u00a0kernel_entry);\r\n\u00a0\u00a0bootstage_mark(BOOTSTAGE_ID_RUN_OS);\r\n\u00a0\u00a0announce_and_cleanup(fake);\r\n\u00a0\u00a0if\u00a0(IMAGE_ENABLE_OF_LIBFDT\u00a0&&\u00a0images->ft_len)\r\n\u00a0\u00a0\u00a0\u00a0r2\u00a0=\u00a0(unsigned\u00a0long)images->ft_addr;\r\n\u00a0\u00a0else\r\n\u00a0\u00a0\u00a0\u00a0r2\u00a0=\u00a0gd->bd->bi_boot_params;\r\n...\r\n}<\/pre>\n
r2 \u4f5c\u4e3a\u5b58\u653e\u8bbe\u5907\u6811\u5730\u5740\u7684\u5bc4\u5b58\u5668\uff0c\u5176\u53d6\u503c\u6709\u4e24\u79cd\u65b9\u5f0f\uff0c\u5206\u522b\u662f\u4f8b\u5316 bootm_header_t \u8fd9\u4e2a\u6570\u636e\u7ed3\u6784\u7684 ft_addr\uff0c\u4ee5\u53ca\u5229\u7528 U-Boot \u7684\u677f\u7ea7\u542f\u52a8\u53c2\u6570\u4f5c\u4e3a\u8bbe\u5907\u6811\u7684\u5730\u5740\u3002<\/p>\n
bootm_header_t \u65b9\u5f0f<\/strong><\/span><\/div>\n
\u6570\u636e\u7ed3\u6784 bootm_header_t \u7684\u5b9a\u4e49\u5982\u4e0b\uff0c\u4f9b\u5404\u79cd\u5185\u6838\u7684 SoC \u4f7f\u7528\uff0c\u6bcf\u5bb6\u5382\u5546\u6839\u636e\u81ea\u5df1 CPU \u7684\u7279\u70b9\u5bf9\u5404\u4e2a\u6210\u5458\u8fdb\u884c\u4e0d\u540c\u7684\u4f8b\u5316\u3002<\/p>\n
\/*\r\n\u00a0*\u00a0Legacy\u00a0and\u00a0FIT\u00a0format\u00a0headers\u00a0used\u00a0by\u00a0do_bootm()\u00a0and\u00a0do_bootm_<os>()\r\n\u00a0*\u00a0routines.\r\n\u00a0*\/\r\ntypedef\u00a0struct\u00a0bootm_headers\u00a0{\r\n\u00a0\u00a0...\r\n\u00a0\u00a0char\u00a0\u00a0\u00a0\u00a0*ft_addr;\u00a0\u00a0\/*\u00a0flat\u00a0dev\u00a0tree\u00a0address\u00a0*\/\r\n\u00a0\u00a0ulong\u00a0\u00a0\u00a0\u00a0ft_len;\u00a0\u00a0\u00a0\u00a0\/*\u00a0length\u00a0of\u00a0flat\u00a0device\u00a0tree\u00a0*\/\r\n\u00a0\u00a0...\r\n}\u00a0bootm_headers_t;<\/pre>\n
\u7528 bootm_header_t \u7684\u65b9\u5f0f\uff0cU-Boot \u9700\u652f\u6301\u8bbe\u5907\u6811\u4ee5\u53ca\u6587\u4ef6\u975e\u7a7a\u3002<\/p>\n
$\"\"$ <\/p>\n
ft_len \u4ee5\u53ca ft_addr \u5c5e\u4e8e bootm_header_t\uff0c\u5728 U-Boot \u89e3\u6790\u955c\u50cf\u6587\u4ef6\u65f6\uff0c\u5b9e\u4f8b\u5316\u8fd9\u4e24\u4e2a\u6210\u5458\u3002\u51fd\u6570\u8c03\u7528\u6808\u5982\u4e0b\uff1a<\/p>\n
do_bootz(struct\u00a0cmd_tbl\u00a0*cmdtp,\u00a0int\u00a0flag,\u00a0int\u00a0argc,\u00a0char\u00a0*const\u00a0argv[])\r\n-bootz_start()\r\n--bootm_find_images(int\u00a0flag,\u00a0int\u00a0argc,\u00a0char\u00a0*const\u00a0argv[],\u00a0ulong\u00a0start,ulong\u00a0size)\r\n---boot_get_fdt(flag,\u00a0argc,\u00a0argv,\u00a0IH_ARCH_DEFAULT,\u00a0&images,&images.ft_addr,\u00a0&images.ft_len);\r\n\u00a0\u00a0\u00a0u-boot-v2021.04\/common\/image-fdt.c<\/pre>\n
gd->bd->bi_boot_params \u65b9\u5f0f<\/strong><\/span><\/div>\n
\u8fd9\u79cd\u5c5e\u4e8e\u6bd4\u8f83\u53e4\u8001\u7684\u4e00\u79cd\u65b9\u5f0f\u4e86\uff0c\u76ee\u524d\u57fa\u672c\u4e0d\u4f1a\u91c7\u7528\u3002bi_boot_params \u662f\u4e00\u4e2a\u5b58\u653e\u5185\u6838\u542f\u52a8\u53c2\u6570\u7684\u5730\u5740\uff0c\u901a\u5e38\u662f\u5728\u677f\u7ea7\u521d\u59cb\u5316\u4e2d\u8fdb\u884c\u6307\u5b9a\u3002<\/p>\n
\u4ee3\u7801\u6267\u884c\u5230\u6b64\u5904\uff0cr2 \u662f\u5426\u4e3a\u9884\u671f\u7684\u503c\uff0c\u4e00\u662f\u53ef\u4ee5\u901a\u8fc7\u6253\u5370\u7684\u65b9\u5f0f\u3001\u518d\u6709\u4f7f\u7528\u8c03\u8bd5\u5de5\u5177\u8fde\u4e0a\u53bb\u786e\u8ba4\u3002<\/p>\n
kernel \u5bf9\u8bbe\u5907\u6811\u7684\u89e3\u6790<\/strong><\/div>\n
\u89e3\u6790\u5206\u4e24\u4e2a\u9636\u6bb5\uff0c\u7b2c\u4e00\u9636\u6bb5\u8fdb\u884c\u6821\u9a8c\u4ee5\u53ca\u542f\u52a8\u53c2\u6570\u7684\u518d\u8c03\u6574\uff1b\u7b2c\u4e8c\u9636\u6bb5\u5b8c\u6210\u8bbe\u5907\u6811\u7684\u89e3\u538b\uff0c\u4e5f\u5c31\u662f\u5c06\u8bbe\u5907\u6811\u7531 FDT \u53d8\u6210 EDT\uff0c\u521b\u5efa device_node\u3002<\/p>\n
\u7b2c\u4e00\u9636\u6bb5<\/strong><\/span><\/div>\n
kernel \u542f\u52a8\u65e5\u5fd7\u4e2d\u4e0e\u8bbe\u5907\u6811\u76f8\u5173\u7684\u7b2c\u4e00\u6761\u6253\u5370\u5982\u4e0b\uff0c\u4e5f\u5c31\u662f\u6253\u5370\u51fa\u5f53\u524d\u786c\u4ef6\u8bbe\u5907\u7684\u6a21\u578b\u540d\uff0c\"OF: fdt: Machine model: V2P-CA9\" \u3002<\/p>\n
Booting\u00a0Linux\u00a0on\u00a0physical\u00a0CPU\u00a00x0\r\nLinux\u00a0version\u00a05.4.124\u00a0(qemu@qemu)\u00a0(gcc\u00a0version\u00a06.5.0\u00a0(Linaro\u00a0GCC\u00a06.5-2018.12))\u00a0#3\u00a0SMP\u00a0Fri\u00a0Jun\u00a025\u00a015:26:02\u00a0CST\u00a02021\r\nCPU:\u00a0ARMv7\u00a0Processor\u00a0[410fc090]\u00a0revision\u00a00\u00a0(ARMv7),\u00a0cr=10c5387d\r\nCPU:\u00a0PIPT\u00a0\/\u00a0VIPT\u00a0nonaliasing\u00a0data\u00a0cache,\u00a0VIPT\u00a0nonaliasing\u00a0instruction\u00a0cache\r\nOF:\u00a0fdt:\u00a0Machine\u00a0model:\u00a0V2P-CA9<\/pre>\n
\u8fd9\u4e2a\u6a21\u578b\u540d\u662f\u5728\u8bbe\u5907\u6811\u6587\u4ef6\u7684\u5934\u90e8\u5b9a\u4e49\u7684\uff0c\u5b9a\u4e49\u5f53\u524d\u8bbe\u5907\u7684\u603b\u4f53\u540d\u79f0\u3002<\/p>\n
\/\/\u00a0SPDX-License-Identifier:\u00a0GPL-2.0\r\n\/*\r\n\u00a0*\u00a0ARM\u00a0Ltd.\u00a0Versatile\u00a0Express\r\n\u00a0*\r\n\u00a0*\u00a0CoreTile\u00a0Express\u00a0A9x4\r\n\u00a0*\u00a0Cortex-A9\u00a0MPCore\u00a0(V2P-CA9)\r\n\u00a0*\r\n\u00a0*\u00a0HBI-0191B\r\n\u00a0*\/\r\n\/dts-v1\/;\r\n#include\u00a0\"vexpress-v2m.dtsi\"\r\n\/\u00a0{\r\n\u00a0\u00a0model\u00a0=\u00a0\"V2P-CA9\";\r\n\u00a0\u00a0...\r\n\u00a0\u00a0}<\/pre>\n
\u4f46\u8fd9\u5e76\u4e0d\u662f kernel \u5bf9\u8bbe\u5907\u6811\u7b2c\u4e00\u6b21\u8fdb\u884c\u5904\u7406\u7684\u5730\u65b9\u3002\u5728\u6b64\u4e4b\u524d\u5df2\u6709\u5176\u4ed6\u7684\u64cd\u4f5c\u3002\u51fd\u6570\u8c03\u7528\u6808\u5982\u4e0b\uff1a<\/p>\n
setup_arch(char\u00a0**cmdline_p)\u00a0arch\/arm\/kernel\/setup.c\r\n\u00a0\u00a0\u00a0\u00a0atags_vaddr\u00a0=\u00a0FDT_VIRT_BASE(__atags_pointer);\r\n\u00a0\u00a0\u00a0\u00a0setup_machine_fdt(void\u00a0*dt_virt)\u00a0arch\/arm\/kernel\/devtree.c\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0early_init_dt_verify()\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0of_flat_dt_match_machine()\u00a0\u00a0drivers\/of\/fdt.c\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0early_init_dt_scan_nodes();\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0__machine_arch_type\u00a0=\u00a0mdesc->nr;<\/pre>\n
\u7b2c 2 \u884c\u3001__atags_pointer \u662f dtb \u5728\u5185\u5b58\u4e2d\u7684\u5730\u5740\uff0c\u8fd9\u4e2a\u5730\u5740\u5728\u6c47\u7f16\u9636\u6bb5\uff08\u82e5\u955c\u50cf\u4e3a zImage\uff0c\u90a3\u4e48\u5728\u89e3\u538b\u7f29\u9636\u6bb5\u5c31\u5b8c\u6210\u4e86\uff09\u4fbf\u83b7\u53d6\u5230\u4e86\u3002\u7531\u4e8e\u6267\u884c\u5230 setup_arch \u65f6 mmu \u5df2\u7ecf\u4f7f\u80fd\u5e76\u4e14 4K \u7684\u6bb5\u9875\u8868\u4e5f\u5df2\u7ecf\u5b8c\u6210\u4e86\u6620\u5c04\uff0c\u800c U-Boot \u4f20\u9012\u7ed9 kernel \u7684\u8bbe\u5907\u6811 fdt \u5730\u5740\u5c5e\u4e8e\u7269\u7406\u5730\u5740\uff0c\u56e0\u6b64\u9700\u8981\u5c06\u7269\u7406\u5730\u5740\u8f6c\u6362\u6210\u865a\u62df\u5730\u5740\u3002<\/p>\n
head-common.S\r\n\u00a0\u00a0.align\u00a0\u00a02\r\n\u00a0\u00a0.type\u00a0\u00a0__mmap_switched_data,\u00a0%object\r\n__mmap_switched_data:\r\n#ifdef\u00a0CONFIG_XIP_KERNEL\r\n#ifndef\u00a0CONFIG_XIP_DEFLATED_DATA\r\n\u00a0\u00a0.long\u00a0\u00a0_sdata\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0@\u00a0r0\r\n\u00a0\u00a0.long\u00a0\u00a0__data_loc\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0@\u00a0r1\r\n\u00a0\u00a0.long\u00a0\u00a0_edata_loc\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0@\u00a0r2\r\n#endif\r\n\u00a0\u00a0.long\u00a0\u00a0__bss_stop\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0@\u00a0sp\u00a0(temporary\u00a0stack\u00a0in\u00a0.bss)\r\n#endif\r\n\u00a0\u00a0.long\u00a0\u00a0__bss_start\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0@\u00a0r0\r\n\u00a0\u00a0.long\u00a0\u00a0__bss_stop\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0@\u00a0r1\r\n\u00a0\u00a0.long\u00a0\u00a0init_thread_union\u00a0+\u00a0THREAD_START_SP\u00a0@\u00a0sp\r\n\u00a0\u00a0.long\u00a0\u00a0processor_id\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0@\u00a0r0\r\n\u00a0\u00a0.long\u00a0\u00a0__machine_arch_type\u00a0\u00a0\u00a0\u00a0@\u00a0r1\r\n\u00a0\u00a0.long\u00a0\u00a0__atags_pointer\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0@\u00a0r2<\/pre>\n
\u7b2c\u4e00\u9636\u6bb5\u5bf9\u8bbe\u5907\u6811\u7684\u914d\u7f6e\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n
A \u5bf9 dtb \u6587\u4ef6\u8fdb\u884c crc32 \u6821\u9a8c\uff0c\u68c0\u6d4b\u8bbe\u5907\u6811\u6587\u4ef6\u662f\u5426\u5408\u6cd5 early_init_dt_verify()<\/p>\n
B\u00a0early_init_dt_scan_nodes()\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/*\u00a0Retrieve\u00a0various\u00a0information\u00a0from\u00a0the\u00a0\/chosen\u00a0node\u00a0*\/\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0of_scan_flat_dt(early_init_dt_scan_chosen,\u00a0boot_command_line);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/*\u00a0Initialize\u00a0{size,address}-cells\u00a0info\u00a0*\/\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0of_scan_flat_dt(early_init_dt_scan_root,\u00a0NULL);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/*\u00a0Setup\u00a0memory,\u00a0calling\u00a0early_init_dt_add_memory_arch\u00a0*\/\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0of_scan_flat_dt(early_init_dt_scan_memory,\u00a0NULL);\r\nC\u00a0\u66f4\u65b0__machine_arch_type\r\nD\u00a0\u66f4\u65b0\u00a0chosen<\/pre>\n
\u4e0a\u9762\u8fd9\u4e2a chosen \u4fe1\u606f\u53ef\u4ee5\u5728 kernel \u8d77\u6765\u540e\u518d\u6b21\u67e5\u770b\u505a\u4e86\u54ea\u4e9b\u4fee\u6539\u3002<\/p>\n
\u7b2c\u4e8c\u9636\u6bb5<\/strong><\/span><\/div>\n
\u7b2c\u4e8c\u9636\u6bb5\u5355\u7eaf\u7684\u662f\u5c06\u8bbe\u5907\u6811 ABI \u6587\u4ef6\u8fdb\u884c\u89e3\u538b\u7f29\uff0c\u7531 FDT \u53d8\u6210 EDT\uff0c\u751f\u6210\u76f8\u5e94\u7684 device_node \u7ed3\u70b9\u3002\u8fd9\u4e2a\u9636\u6bb5\u7684\u51fd\u6570\u8c03\u7528\u6808\u5982\u4e0b\uff1a<\/p>\n
unflatten_device_tree();\r\n\u00a0\u00a0\u00a0\u00a0*__unflatten_device_tree()\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/*\u00a0First\u00a0pass,\u00a0scan\u00a0for\u00a0size\u00a0*\/\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0size\u00a0=\u00a0unflatten_dt_nodes(blob,\u00a0NULL,\u00a0dad,\u00a0NULL);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/*\u00a0Second\u00a0pass,\u00a0do\u00a0actual\u00a0unflattening\u00a0*\/\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0unflatten_dt_nodes(blob,\u00a0mem,\u00a0dad,\u00a0mynodes);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0unflatten_dt_nodes()\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0populate_node()<\/pre>\n
device_nodes \u7ed3\u70b9\u5982\u4e0b\uff1a<\/p>\n
$\"\"$ <\/p>\n
device_node \u521b\u5efa\u5b8c\u6210\u540e\uff0ckernel \u521b\u5efa platform_device \u65f6\u4f9d\u636e\u8fd9\u4e2a\u9636\u6bb5\u5b8c\u6210\u7684\u5de5\u4f5c\u60c5\u51b5\u8fdb\u884c\u5bf9\u5e94\u7684\u8bbe\u5907\u6ce8\u518c\uff0c\u4f9b\u9a71\u52a8\u4ee3\u7801\u4f7f\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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