bootz启动 Linux内核过程中涉及的全局变量images

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。

本文具体分析 bootz启动 Linux内核过程涉及的一个重要的全局变量 images。

二.  bootz 启动 Linux 内核过程

1.  images 全局变量

bootm_headers_t images;		/* pointers to os/initrd/fdt images */

typedef struct bootm_headers {
	/*
	 * Legacy os image header, if it is a multi component image
	 * then boot_get_ramdisk() and get_fdt() will attempt to get
	 * data from second and third component accordingly.
	 */
	image_header_t	*legacy_hdr_os;		/* image header pointer */
	image_header_t	legacy_hdr_os_copy;	/* header copy */
	ulong		legacy_hdr_valid;
.......
#ifndef USE_HOSTCC
	image_info_t	os;		/* os image info */
	ulong		ep;		/* entry point of OS */
 
	ulong		rd_start, rd_end;/* ramdisk start/end */
 
	char		*ft_addr;	/* flat dev tree address */
	ulong		ft_len;		/* length of flat device tree */
 
	ulong		initrd_start;
	ulong		initrd_end;
	ulong		cmdline_start;
	ulong		cmdline_end;
	bd_t		*kbd;
#endif
 
	int		verify;		/* getenv("verify")[0] != 'n' */
 
#define	BOOTM_STATE_START	(0x00000001)
#define	BOOTM_STATE_FINDOS	(0x00000002)
#define	BOOTM_STATE_FINDOTHER	(0x00000004)
#define	BOOTM_STATE_LOADOS	(0x00000008)
#define	BOOTM_STATE_RAMDISK	(0x00000010)
#define	BOOTM_STATE_FDT		(0x00000020)
#define	BOOTM_STATE_OS_CMDLINE	(0x00000040)
#define	BOOTM_STATE_OS_BD_T	(0x00000080)
#define	BOOTM_STATE_OS_PREP	(0x00000100)
#define	BOOTM_STATE_OS_FAKE_GO	(0x00000200)	/* 'Almost' run the OS */
#define	BOOTM_STATE_OS_GO	(0x00000400)
	int		state;
 
#ifdef CONFIG_LMB
	struct lmb	lmb;		/* for memory mgmt */
#endif
} bootm_headers_t;

typedef struct image_info {
	ulong		start, end;		/* start/end of blob */
	ulong		image_start, image_len; /* start of image within blob, len of image */
	ulong		load;			/* load addr for the image */
	uint8_t		comp, type, os;		/* compression, type of image, os type */
	uint8_t		arch;			/* CPU architecture */
} image_info_t;