uboot bd_info

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最新推荐文章于 2024-08-19 20:19:38 发布

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分类专栏： uboot 源码研究

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本文详细介绍了U-Boot启动过程中向Linux内核传递的板级信息结构bd_info。该结构包含了内存、闪存、SRAM等硬件资源的配置信息，以及以太网地址、频率配置等系统参数。

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include/asm-generic/u-boot.h

bd_info:


/*
 * Board information passed to Linux kernel from U-Boot
 *
 * include/asm-ppc/u-boot.h
 */
#ifndef __ASSEMBLY__
typedef struct bd_info {
 unsigned long bi_memstart; /* start of DRAM memory */
 phys_size_t bi_memsize; /* size  of DRAM memory in bytes */
 unsigned long bi_flashstart; /* start of FLASH memory */
 unsigned long bi_flashsize; /* size  of FLASH memory */
 unsigned long bi_flashoffset; /* reserved area for startup monitor */
 unsigned long bi_sramstart; /* start of SRAM memory */
 unsigned long bi_sramsize; /* size  of SRAM memory */
#ifdef CONFIG_AVR32
 unsigned char   bi_phy_id[4];   /* PHY address for ATAG_ETHERNET */
 unsigned long   bi_board_number;/* ATAG_BOARDINFO */
#endif
#ifdef CONFIG_ARM
 unsigned long bi_arm_freq; /* arm frequency */
 unsigned long bi_dsp_freq; /* dsp core frequency */
 unsigned long bi_ddr_freq; /* ddr frequency */
#endif
#if defined(CONFIG_5xx) || defined(CONFIG_8xx) || defined(CONFIG_MPC8260) \
 || defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
 unsigned long bi_immr_base; /* base of IMMR register */
#endif
#if defined(CONFIG_MPC5xxx) || defined(CONFIG_M68K)
 unsigned long bi_mbar_base; /* base of internal registers */
#endif
#if defined(CONFIG_MPC83xx)
 unsigned long bi_immrbar;
#endif
 unsigned long bi_bootflags; /* boot / reboot flag (Unused) */
 unsigned long bi_ip_addr; /* IP Address */
 unsigned char bi_enetaddr[6]; /* OLD: see README.enetaddr */
 unsigned short bi_ethspeed; /* Ethernet speed in Mbps */
 unsigned long bi_intfreq; /* Internal Freq, in MHz */
 unsigned long bi_busfreq; /* Bus Freq, in MHz */
#if defined(CONFIG_CPM2)
 unsigned long bi_cpmfreq; /* CPM_CLK Freq, in MHz */
 unsigned long bi_brgfreq; /* BRG_CLK Freq, in MHz */
 unsigned long bi_sccfreq; /* SCC_CLK Freq, in MHz */
 unsigned long bi_vco;  /* VCO Out from PLL, in MHz */
#endif
#if defined(CONFIG_MPC512X)
 unsigned long bi_ipsfreq; /* IPS Bus Freq, in MHz */
#endif /* CONFIG_MPC512X */
#if defined(CONFIG_MPC5xxx) || defined(CONFIG_M68K)
 unsigned long bi_ipbfreq; /* IPB Bus Freq, in MHz */
 unsigned long bi_pcifreq; /* PCI Bus Freq, in MHz */
#endif
#if defined(CONFIG_EXTRA_CLOCK)
 unsigned long bi_inpfreq; /* input Freq in MHz */
 unsigned long bi_vcofreq; /* vco Freq in MHz */
 unsigned long bi_flbfreq; /* Flexbus Freq in MHz */
#endif
#if defined(CONFIG_405)   || \
  defined(CONFIG_405GP) || \
  defined(CONFIG_405EP) || \
  defined(CONFIG_405EZ) || \
  defined(CONFIG_405EX) || \
  defined(CONFIG_440)
 unsigned char bi_s_version[4]; /* Version of this structure */
 unsigned char bi_r_version[32]; /* Version of the ROM (AMCC) */
 unsigned int bi_procfreq; /* CPU (Internal) Freq, in Hz */
 unsigned int bi_plb_busfreq; /* PLB Bus speed, in Hz */
 unsigned int bi_pci_busfreq; /* PCI Bus speed, in Hz */
 unsigned char bi_pci_enetaddr[6]; /* PCI Ethernet MAC address */
#endif
#ifdef CONFIG_HAS_ETH1
 unsigned char   bi_enet1addr[6]; /* OLD: see README.enetaddr */
#endif
#ifdef CONFIG_HAS_ETH2
 unsigned char bi_enet2addr[6]; /* OLD: see README.enetaddr */
#endif
#ifdef CONFIG_HAS_ETH3
 unsigned char   bi_enet3addr[6]; /* OLD: see README.enetaddr */
#endif
#ifdef CONFIG_HAS_ETH4
 unsigned char   bi_enet4addr[6]; /* OLD: see README.enetaddr */
#endif
#ifdef CONFIG_HAS_ETH5
 unsigned char   bi_enet5addr[6]; /* OLD: see README.enetaddr */
#endif
#if defined(CONFIG_405GP) || defined(CONFIG_405EP) || \
  defined(CONFIG_405EZ) || defined(CONFIG_440GX) || \
  defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
  defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
  defined(CONFIG_460EX) || defined(CONFIG_460GT)
 unsigned int bi_opbfreq;  /* OPB clock in Hz */
 int  bi_iic_fast[2];  /* Use fast i2c mode */
#endif
#if defined(CONFIG_4xx)
#if defined(CONFIG_440GX) || \
  defined(CONFIG_460EX) || defined(CONFIG_460GT)
 int  bi_phynum[4];           /* Determines phy mapping */
 int  bi_phymode[4];          /* Determines phy mode */
#elif defined(CONFIG_405EP) || defined(CONFIG_405EX) || defined(CONFIG_440)
 int  bi_phynum[2];           /* Determines phy mapping */
 int  bi_phymode[2];          /* Determines phy mode */
#else
 int  bi_phynum[1];           /* Determines phy mapping */
 int  bi_phymode[1];          /* Determines phy mode */
#endif
#endif /* defined(CONFIG_4xx) */
 ulong         bi_arch_number; /* unique id for this board */
 ulong         bi_boot_params; /* where this board expects params */
#ifdef CONFIG_NR_DRAM_BANKS
 struct {   /* RAM configuration */
  phys_addr_t start;
  phys_size_t size;
 } bi_dram[CONFIG_NR_DRAM_BANKS];
#endif /* CONFIG_NR_DRAM_BANKS */
} bd_t;
#endif /* __ASSEMBLY__ */