深圳市福田建设局网站,文创产品设计就业前景,wordpress 分类下排序,一六八互联网站建设以下内容源于网络资源的学习与整理#xff0c;如有侵权请告知删除。 一、do_movi函数分析
当执行movi相关命令时#xff0c;实际执行的是do_movi函数。
x210 # help movi
movi init - Initialize moviNAND and show card info
movi read {u-boot | kernel} {addr} - Read …以下内容源于网络资源的学习与整理如有侵权请告知删除。 一、do_movi函数分析
当执行movi相关命令时实际执行的是do_movi函数。
x210 # help movi
movi init - Initialize moviNAND and show card info
movi read {u-boot | kernel} {addr} - Read data from sd/mmc
movi write {fwbl1 | u-boot | kernel} {addr} - Write data to sd/mmc
movi read rootfs {addr} [bytes(hex)] - Read rootfs data from sd/mmc by size
movi write rootfs {addr} [bytes(hex)] - Write rootfs data to sd/mmc by size
movi read {sector#} {bytes(hex)} {addr} - instead of this, you can use mmc read
movi write {sector#} {bytes(hex)} {addr} - instead of this, you can use mmc writex210 # movi read kernel 30008000
reading kernel.. 1073, 8192
MMC read: dev # 0, block # 1073, count 8192 ...8192 blocks read: OK
completed
x210 #
该函数位于/common/cmd_movi.c文件中根据是否定义了CONFIG_GENERIC_MMC这个宏来选择不同的内容。因为在/include/configs/X210_sd.h文件定义了这个宏所以这里的do_movi函数是底下的那个。 删除条件编译语句后该函数的内容与分析以“movi read kernel 30008000”为例进如下
/*
执行命令“ movi read kernel 30008000 ”时
argc4argv[0]movi,argv[1]read,argv[2]kenel,argv[3]30008000
*/int do_movi(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{char *cmd;ulong addr, start_blk, blkcnt;uint rfs_size;char run_cmd[100];uint rw 0, attribute 0;int i;member_t *image;struct mmc *mmc;int dev_num 0;#if defined(CONFIG_VOGUES)//不满足int boot_dev;
#endifcmd argv[1];// cmdreadswitch (cmd[0]) {case i://i即initraw_area_control.magic_number 0;run_command(mmcinfo, 0);return 1;case r: //r即read选择这个rw 0; /* read case */break;case w://w即writerw 1; /* write case */break;default:goto usage;}cmd argv[2];//cmdkernelswitch (cmd[0]) {case f://f即fwbl1if (argc ! 4)goto usage;attribute 0x0;addr simple_strtoul(argv[3], NULL, 16);break;case u://u即u-bootif (argc ! 4)goto usage;attribute 0x2;addr simple_strtoul(argv[3], NULL, 16);break;case k://k即kernel选择这个if (argc ! 4)goto usage;attribute 0x4;addr simple_strtoul(argv[3], NULL, 16);//把字符串形式的数字转为数字此时addr30008000break;case r://r即rootfsif (argc ! 5)goto usage;attribute 0x8;addr simple_strtoul(argv[3], NULL, 16);break;default:goto usage;}#if defined(CONFIG_VOGUES)//不满足boot_dev movi_boot_src();if (boot_dev) {/* boot device is NOR *//* read kernel from eMMC */mmc find_mmc_device(0);printf(MMC #0 is boot device\r\n);} else {/* boot device is SD card *//* read kernel from SD card */mmc find_mmc_device(1);printf(MMC #1 is boot device\r\n);}
#else//执行这个mmc find_mmc_device(dev_num);//这里的dev_num在开头就赋值为0表示inand。
#endifmmc_init(mmc);//初始化/* firmware BL1 r/w */if (attribute 0x0) {//不满足因为attribute 0x4/* on write case we should write BL1 1st. */for (i0, image raw_area_control.image; i15; i) {if (image[i].attribute attribute)break;}start_blk image[i].start_blk;blkcnt image[i].used_blk;printf(%s FWBL1 .. %ld, %ld , rw ? writing:reading,start_blk, blkcnt);sprintf(run_cmd,mmc %s 0 0x%lx 0x%lx 0x%lx,rw ? write:read,addr, start_blk, blkcnt);run_command(run_cmd, 0);printf(completed\n);return 1;}/* u-boot r/w */if (attribute 0x2) {//不满足因为attribute 0x4/* on write case we should write BL2 1st. */
#if defined(CONFIG_FUSED) for (i0, image raw_area_control.image; i15; i) {if (image[i].attribute 0x1)break;}start_blk image[i].start_blk;blkcnt image[i].used_blk;printf(%s BL1.. %ld, %ld , rw ? writing:reading,start_blk, blkcnt);sprintf(run_cmd,mmc %s 0 0x%lx 0x%lx 0x%lx,rw ? write:read,addr, start_blk, blkcnt);run_command(run_cmd, 0);printf(completed\n);
#elseif (rw) {start_blk raw_area_control.image[1].start_blk;blkcnt raw_area_control.image[1].used_blk;printf(Writing BL1 to sector %ld (%ld sectors).. ,start_blk, blkcnt);movi_write_bl1(addr);}
#endiffor (i0, image raw_area_control.image; i15; i) {if (image[i].attribute attribute)break;}start_blk image[i].start_blk;blkcnt image[i].used_blk;printf(%s bootloader.. %ld, %ld , rw ? writing:reading,start_blk, blkcnt);#if defined(CONFIG_SECURE_BOOT)
#define BL2_SIZE 8192sprintf(run_cmd,mmc %s 0 0x%lx 0x%lx 0x%lx,rw ? write:read,addr BL2_SIZE, start_blk, blkcnt);
#elsesprintf(run_cmd,mmc %s 0 0x%lx 0x%lx 0x%lx,rw ? write:read,addr, start_blk, blkcnt);
#endifrun_command(run_cmd, 0);printf(completed\n);return 1;}/* kernel r/w */if (attribute 0x4) {//满足因为attribute 0x4for (i0, image raw_area_control.image; i15; i) {if (image[i].attribute attribute)//根据attribute来匹配到底是哪个image[]即raw分区表中的哪个分区break;}start_blk image[i].start_blk;//计算这个分区的信息起始扇区号、blkcnt image[i].used_blk;printf(%s kernel.. %ld, %ld , rw ? writing : reading,start_blk, blkcnt);#if defined(CONFIG_VOGUES)//不满足if (boot_dev)sprintf(run_cmd, mmc %s 0 0x%lx 0x%lx 0x%lx,rw ? write : read, addr, start_blk, blkcnt);elsesprintf(run_cmd, mmc %s 1 0x%lx 0x%lx 0x%lx,rw ? write : read, addr, start_blk, blkcnt);#else//执行这个sprintf(run_cmd, mmc %s 0 0x%lx 0x%lx 0x%lx,rw ? write : read, addr, start_blk, blkcnt);//rw0所以是read#endifrun_command(run_cmd, 0);//最终调用run_command函数来运行命令printf(completed\n);return 1;}/* root file system r/w */if (attribute 0x8) {//不满足因为attribute 0x4rfs_size simple_strtoul(argv[4], NULL, 16);for (i0, image raw_area_control.image; i15; i) {if (image[i].attribute attribute)break;}start_blk image[i].start_blk;blkcnt rfs_size/MOVI_BLKSIZE ((rfs_size(MOVI_BLKSIZE-1)) ? 1 : 0);image[i].used_blk blkcnt;printf(%s RFS.. %ld, %ld , rw ? writing:reading,start_blk, blkcnt);sprintf(run_cmd,mmc %s 0 0x%lx 0x%lx 0x%lx,rw ? write:read,addr, start_blk, blkcnt);run_command(run_cmd, 0);printf(completed\n);return 1;}return 1;usage:printf(Usage:\n%s\n, cmdtp-usage);return -1;
}二、init_raw_area_table函数分析
注意到上面的do_movi函数中频繁用到member_t *image这个变量。
其中member_t是struct member结构体的别名这个结构体的一个实例就表示一个分区的信息。
/** start_blk: start block number for image* used_blk: blocks occupied by image* size: image size in bytes* attribute: attributes of image* 0x1: u-boot parted (BL1)* 0x2: u-boot (BL2)* 0x4: kernel* 0x8: root file system* 0x10: environment area* 0x20: reserved* description: description for image* by scsuh*/
typedef struct member {uint start_blk;uint used_blk;uint size;uint attribute; /* attribute of image */char description[16];
} member_t; /* 32 bytes */
在/common/cmd_movi.c文件中init_raw_area_table函数构建了一个raw分区表。
raw分区表的数据类型如下这个数据类型的一个实例就是一个raw分区表
/** magic_number: 0x24564236* start_blk: start block number for raw area* total_blk: total block number of card* next_raw_area: add next raw_area structure* description: description for raw_area* image: several image that is controlled by raw_area structure* by scsuh*/
typedef struct raw_area {uint magic_number; /* to identify itself */uint start_blk; /* compare with PT on coherency test */uint total_blk;uint next_raw_area; /* should be sector number */char description[16];member_t image[15];
} raw_area_t; /* 512 bytes */
//定义raw_area_t数据类型的一个变量raw_area_control即定义一个分区表
//后面将填充这个变量的image[]成员image[]成员表示具体分区的信息
raw_area_t raw_area_control;int init_raw_area_table (block_dev_desc_t * dev_desc)
{struct mmc *host find_mmc_device(dev_desc-dev);/* when last block does not have raw_area definition. */if (raw_area_control.magic_number ! MAGIC_NUMBER_MOVI) {int i 0;member_t *image;u32 capacity;if (host-high_capacity) {capacity host-capacity;#ifdef CONFIG_S3C6410if(IS_SD(host))capacity - 1024;#endif} else {capacity host-capacity;}dev_desc-block_read(dev_desc-dev,capacity - (eFUSE_SIZE/MOVI_BLKSIZE) - 1,1, raw_area_control);if (raw_area_control.magic_number MAGIC_NUMBER_MOVI) {return 0;}dbg(Warning: cannot find the raw area table(%p) %08x\n,raw_area_control, raw_area_control.magic_number);/* add magic number */raw_area_control.magic_number MAGIC_NUMBER_MOVI;/* init raw_area will be 16MB */raw_area_control.start_blk 16*1024*1024/MOVI_BLKSIZE;raw_area_control.total_blk capacity;raw_area_control.next_raw_area 0;strcpy(raw_area_control.description, initial raw table);image raw_area_control.image;//指向分区表的开头位置#if defined(CONFIG_EVT1)#if defined(CONFIG_FUSED)/* image 0 should be fwbl1 */image[0].start_blk (eFUSE_SIZE/MOVI_BLKSIZE);image[0].used_blk MOVI_FWBL1_BLKCNT;image[0].size FWBL1_SIZE;image[0].attribute 0x0;strcpy(image[0].description, fwbl1);dbg(fwbl1: %d\n, image[0].start_blk);#endif
#endif/* image 1 should be bl2 */
#if defined(CONFIG_EVT1)#if defined(CONFIG_FUSED)image[1].start_blk image[0].start_blk MOVI_FWBL1_BLKCNT;#elseimage[1].start_blk (eFUSE_SIZE/MOVI_BLKSIZE);#endif
#elseimage[1].start_blk capacity - (eFUSE_SIZE/MOVI_BLKSIZE) -MOVI_BL1_BLKCNT;
#endifimage[1].used_blk MOVI_BL1_BLKCNT;image[1].size SS_SIZE;image[1].attribute 0x1;strcpy(image[1].description, u-boot parted);dbg(bl1: %d\n, image[1].start_blk);/* image 2 should be environment */
#if defined(CONFIG_EVT1)image[2].start_blk image[1].start_blk MOVI_BL1_BLKCNT;
#elseimage[2].start_blk image[1].start_blk - MOVI_ENV_BLKCNT;
#endifimage[2].used_blk MOVI_ENV_BLKCNT;image[2].size CFG_ENV_SIZE;image[2].attribute 0x10;strcpy(image[2].description, environment);dbg(env: %d\n, image[2].start_blk);/* image 3 should be bl2 */
#if defined(CONFIG_EVT1)image[3].start_blk image[2].start_blk MOVI_ENV_BLKCNT;
#elseimage[3].start_blk image[2].start_blk - MOVI_BL2_BLKCNT;
#endifimage[3].used_blk MOVI_BL2_BLKCNT;image[3].size PART_SIZE_BL;image[3].attribute 0x2;strcpy(image[3].description, u-boot);dbg(bl2: %d\n, image[3].start_blk);/* image 4 should be kernel */
#if defined(CONFIG_EVT1)image[4].start_blk image[3].start_blk MOVI_BL2_BLKCNT;
#elseimage[4].start_blk image[3].start_blk - MOVI_ZIMAGE_BLKCNT;
#endifimage[4].used_blk MOVI_ZIMAGE_BLKCNT;image[4].size PART_SIZE_KERNEL;image[4].attribute 0x4;strcpy(image[4].description, kernel);dbg(knl: %d\n, image[4].start_blk);/* image 5 should be RFS */
#if defined(CONFIG_EVT1)image[5].start_blk image[4].start_blk MOVI_ZIMAGE_BLKCNT;
#elseimage[5].start_blk image[4].start_blk - MOVI_ROOTFS_BLKCNT;
#endifimage[5].used_blk MOVI_ROOTFS_BLKCNT;image[5].size PART_SIZE_ROOTFS;image[5].attribute 0x8;strcpy(image[5].description, rfs);dbg(rfs: %d\n, image[5].start_blk);for (i6; i15; i) {raw_area_control.image[i].start_blk 0;raw_area_control.image[i].used_blk 0;}}
}由于CONFIG_FUSED 宏没有定义故总共5个分区:
image数组扇区号分区名大小image[1]1-16u-boot parted即BL18KBimage[2]17-48environment16KBimage[3]49-1072u-boot即BL2512KBimage[4]1073-9264kernel4MBimage[5]9265-62512rfs即rootfs26MB
注意这里定义的image[5]的扇区号与大小好像不是很适合实际情况
movi命令下的分区表、fastboot命令下的分区表两者相辅相成利用movi或者fastboot flash命令时参数中的bootLoader、kernel、system等标签都可以从这两张表中找到对应的地址。
关于fastboot命令下的分区表见博客如何将镜像烧写至iNandfastboot命令的源码分析。
