uboot 移植之gd_t，bd_t

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gd_t定义在uboot/include/asm-arm/global_data.h

/** (C) Copyright 2002* Wolfgang Denk, DENX Software Engineering, wd@denx.de.** See file CREDITS for list of people who contributed to this* project.** This program is free software; you can redistribute it and/or* modify it under the terms of the GNU General Public License as* published by the Free Software Foundation; either version 2 of* the License, or (at your option) any later version.** This program is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the* GNU General Public License for more details.** You should have received a copy of the GNU General Public License* along with this program; if not, write to the Free Software* Foundation, Inc., 59 Temple Place, Suite 330, Boston,* MA 02111-1307 USA*/#ifndef	__ASM_GBL_DATA_H
#define __ASM_GBL_DATA_H
/** The following data structure is placed in some memory wich is* available very early after boot (like DPRAM on MPC8xx/MPC82xx, or* some locked parts of the data cache) to allow for a minimum set of* global variables during system initialization (until we have set* up the memory controller so that we can use RAM).** Keep it *SMALL* and remember to set CONFIG_SYS_GBL_DATA_SIZE > sizeof(gd_t)*/typedef	struct	global_data {bd_t		*bd;unsigned long	flags;unsigned long	baudrate;unsigned long	have_console;	/* serial_init() was called */unsigned long	env_addr;	/* Address  of Environment struct */unsigned long	env_valid;	/* Checksum of Environment valid? */unsigned long	fb_base;	/* base address of frame buffer */
#ifdef CONFIG_VFDunsigned char	vfd_type;	/* display type */
#endif
#if 0unsigned long	cpu_clk;	/* CPU clock in Hz!		*/unsigned long	bus_clk;phys_size_t	ram_size;	/* RAM size */unsigned long	reset_status;	/* reset status register at boot */
#endifvoid		**jt;		/* jump table */
} gd_t;/** Global Data Flags*/
#define	GD_FLG_RELOC	0x00001		/* Code was relocated to RAM		*/
#define	GD_FLG_DEVINIT	0x00002		/* Devices have been initialized	*/
#define	GD_FLG_SILENT	0x00004		/* Silent mode				*/
#define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed		*/
#define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted		*/
#define	GD_FLG_LOGINIT	0x00020		/* Log Buffer has been initialized	*/
#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */#define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r8")//#endif /* __ASM_GBL_DATA_H */

bd_t定义在uboot/include/asm-arm/u-boot.h

/** (C) Copyright 2002* Sysgo Real-Time Solutions, GmbH <www.elinos.com>* Marius Groeger <mgroeger@sysgo.de>** (C) Copyright 2002* Sysgo Real-Time Solutions, GmbH <www.elinos.com>* Alex Zuepke <azu@sysgo.de>** See file CREDITS for list of people who contributed to this* project.** This program is free software; you can redistribute it and/or* modify it under the terms of the GNU General Public License as* published by the Free Software Foundation; either version 2 of* the License, or (at your option) any later version.** This program is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the* GNU General Public License for more details.** You should have received a copy of the GNU General Public License* along with this program; if not, write to the Free Software* Foundation, Inc., 59 Temple Place, Suite 330, Boston,* MA 02111-1307 USA********************************************************************** NOTE: This header file defines an interface to U-Boot. Including* this (unmodified) header file in another file is considered normal* use of U-Boot, and does *not* fall under the heading of "derived* work".*********************************************************************/#ifndef _U_BOOT_H_
#define _U_BOOT_H_	1typedef struct bd_info {int			bi_baudrate;	/* serial console baudrate */unsigned long	bi_ip_addr;	/* IP Address */struct environment_s	       *bi_env;ulong	        bi_arch_number;	/* unique id for this board */ulong	        bi_boot_params;	/* where this board expects params */struct				/* RAM configuration */{ulong start;ulong size;}			bi_dram[CONFIG_NR_DRAM_BANKS];
} bd_t;#define bi_env_data bi_env->data
#define bi_env_crc  bi_env->crc#endif	/* _U_BOOT_H_ */

可参考
http://hi.baidu.com/shaoyi1110/blog/item/5246f5d1e0ac93123bf3cf56.html

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