一. bootz启动Linux
uboot 启动Linux内核使用bootz命令。当然还有其它的启动命令,例如,bootm命令等等。
本文只分析 bootz命令启动 Linux内核的过程中涉及的几个重要函数。具体分析 do_bootm_states 函数执行过程。
本文继上一篇文章,地址如下:
bootz启动 Linux内核过程中涉及的 bootz_start 函数-CSDN博客
二. bootz 启动 Linux 内核涉及函数
bootz 命令的执行函数为 do_bootz函数。而 do_bootz函数主要调用如下函数:
bootz_start 函数,bootm_disable_interrupts 函数,设置 images.os.os ,do_bootm_states 函数。文章来源:https://www.toymoban.com/news/detail-759439.html
1. do_bootm_states 函数
BOOTM_STATE_OS_PREP
BOOTM_STATE_OS_FAKE_GO
BOOTM_STATE_OS_GO
BOOTM_STATE_START
int do_bootm_states(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int states, bootm_headers_t *images, int boot_progress)
{
boot_os_fn *boot_fn;
ulong iflag = 0;
int ret = 0, need_boot_fn;
images->state |= states;
............
/* From now on, we need the OS boot function */
if (ret)
return ret;
boot_fn = bootm_os_get_boot_func(images->os.os);
need_boot_fn = states & (BOOTM_STATE_OS_CMDLINE |
BOOTM_STATE_OS_BD_T | BOOTM_STATE_OS_PREP |
BOOTM_STATE_OS_FAKE_GO | BOOTM_STATE_OS_GO);
if (boot_fn == NULL && need_boot_fn) {
if (iflag)
enable_interrupts();
printf("ERROR: booting os '%s' (%d) is not supported\n",
genimg_get_os_name(images->os.os), images->os.os);
bootstage_error(BOOTSTAGE_ID_CHECK_BOOT_OS);
return 1;
}
............
if (!ret && (states & BOOTM_STATE_OS_PREP))
ret = boot_fn(BOOTM_STATE_OS_PREP, argc, argv, images);
#ifdef CONFIG_TRACE
/* Pretend to run the OS, then run a user command */
if (!ret && (states & BOOTM_STATE_OS_FAKE_GO)) {
char *cmd_list = getenv("fakegocmd");
ret = boot_selected_os(argc, argv, BOOTM_STATE_OS_FAKE_GO,
images, boot_fn);
if (!ret && cmd_list)
ret = run_command_list(cmd_list, -1, flag);
}
#endif
/* Check for unsupported subcommand. */
if (ret) {
puts("subcommand not supported\n");
return ret;
}
/* Now run the OS! We hope this do not return */
if (!ret && (states & BOOTM_STATE_OS_GO))
ret = boot_selected_os(argc, argv, BOOTM_STATE_OS_GO,
images, boot_fn);
.............
return ret;
}
int boot_selected_os(int argc, char * const argv[], int state, bootm_headers_t *images, boot_os_fn *boot_fn)
{
arch_preboot_os();
boot_fn(state, argc, argv, images);
/* Stand-alone may return when 'autostart' is 'no' */
if (images->os.type == IH_TYPE_STANDALONE ||
state == BOOTM_STATE_OS_FAKE_GO) /* We expect to return */
return 0;
bootstage_error(BOOTSTAGE_ID_BOOT_OS_RETURNED);
#ifdef DEBUG
puts("\n## Control returned to monitor - resetting...\n");
#endif
return BOOTM_ERR_RESET;
}
do_bootm_linux 函数简化代码如下,这里只列出此处会执行到代码:文章来源地址https://www.toymoban.com/news/detail-759439.html
int do_bootm_states(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int states, bootm_headers_t *images, int boot_progress)
{
boot_os_fn *boot_fn;
ulong iflag = 0;
int ret = 0, need_boot_fn;
images->state |= states;
.............
if (!ret && (states & BOOTM_STATE_OS_GO))
ret = boot_selected_os(argc, argv, BOOTM_STATE_OS_GO,
images, boot_fn);
.............
return ret;
}
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