U-BOOTReadMe

U-boot是基于PowerPC, ARM, MIPS等多種處理器上的bootloader,可以裝載在boot ROM中,用于起始化或者測試硬體,或者用于裝載和執行應用程式。




where we come from




- start from 8xxrom sources


- create PPCBoot project (http://sourceforge.net/projects/ppcboot)


- clean up code


- make it easier to add custom boards


- make it possibile to add other [PowerPC] CPUs


- extend functions, especially:


* Provide extended interface to Linux boot loader


* S-Record download


* network boot


* PCMCIA / CompactFlash / ATA disk /SCSI … boot


- create ARMBoot project (http://sourceforge.net/projects/armboot)


- add other CPU families(starting with ARM)


- create U-Boot project (http://sourceforge.net/projects/u-boot)



Names and Spelling:







檔名以u-boot為開頭,例如




#include




#include




變數名,預編譯常數等都以u_boot或者U_BOOT開頭,例如




U_BOOT_VERSION u_boot_logo




IH_OS_U_BOOT u_boot_hush_start




Versioning:





U-Boot版本資訊由version, sub-versionpatchlevel組成。例如”U-Boot-2.34.5”表示version “2”, sub-version “34”, patchlevel “4”.對于正式的發布版本來說,patchlevel總為“0”.



Directory Hierarchy:



- board Board dependent files


- common Misc architecture independent functions


- cpu CPU specific files


- 74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs


- arm720t Files specific to ARM 720 CPUs


- arm920t Files specific to ARM 920 CPUs


- at91rm9200 Files specific to Atmel AT91RM9200 CPU


- imx Files specific to Freescale MC9328 i.MX CPUs


- s3c24x0 Files specific to Samsung S3C24X0 CPUs


- arm925t Files specific to ARM 925 CPUs


- arm926ejs Files specific to ARM 926 CPUs


- arm1136 Files specific to ARM 1136 CPUs


- i386 Files specific to i386 CPUs


- ixp Files specific to Intel Xscale IXP CPUs


- mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs


- mips Files specific to MIPS CPUs


- mpc5xx Files specific to Freescale MPC5xx CPUs


- mpc5xxx Files specific to Freescale MPC5xxx CPUs


- mpc8xx Files specific to Freescale MPC8xx CPUs


- mpc8220 Files specific to Freescale MPC8220 CPUs


- mpc824x Files specific to Freescale MPC824x CPUs


- mpc8260 Files specific to Freescale MPC8260 CPUs


- nios Files specific to Altera NIOS CPUs


- nios2 Files specific to Altera Nios-II CPUs


- ppc4xx Files specific to AMCC PowerPC 4xx CPUs


- pxa Files specific to Intel Xscale PXA CPUs


- s3c4bb0 Files specific to Samsung S3C44B0 CPUs


- sa1100 Files specific to Intel StrongARM SA1100 CPUs


- disk Code for disk drive partition handling


- doc Documentation


- drivers Commonly used device drivers


- dtt Digital Thermometer and Thermostat drivers


- examples Example code for standalone applications, etc


- include Header Files


- lib_arm File generic to ARM architecture


- lib_generic File generic to all architecture


- lib_i386 File generic to i386 architecture


- lib_m68k File generic to m68k architecture


- lib_mips File generic to MIPS architecture


- lib_nios File generic to NIOS architecture


- lib_ppc File generic to PowerPC architecture


- net Networking code


- post Power On Self Test


- rtc Real Time Clock drivers


- tools Tools to build S-Record or U-Boot images, etc




Software Configuration:







Configuration _OPTIONS_:


由用戶指定,以CONFIG_開頭


Configuration_SETTINGS_:


跟具體硬體相關,以CFG_







對于已經支援的board,已有預設的configuration,故需要直接make即可,make


_config.


Example:


cd u-boot


make TQM82L_config


對于Cogent platform,則需要make cogent_mpc8xx_config.


Configuration Options:




Configuration取決于boardCPU類別,其資訊在include/configs/ .h


中,例如include/configs/TQM823L.h


需要指定如下:


- CPU Types: 例如CONFIG_MPC860


- Board Type: 例如 CONFIG_PCIPPC2


- CPU Module Type:(如果定義了CONFIG_COGENT),例如CONFIG_CMA286_60_OLD


- Motherboard Type:(如果定義了CONFIG_COGENT)例如CONFIG_CMA101


- Motherboard I/O Modules: (如果定義了CONFIG_COGENT),例如CONGIG_


CMA302


- Board flavour


- MPC824x Family Member


- 8xx CPU options


- 859/866/865 CPU options


- Linux Kernel Interface:


- Serial Ports


- Console Interface


- Console Baudrate


- Interrupt driven serial port input


- Console UART Number


- Boot Delay


- Autoboot Command


- Pre-Boot Commands


- Serial Download Echo Mode


- Kgdb Serial Baudrate


- Monitor Functions


- Watchdog


- U-Boot Version


- Real-Time Clock


- Timestamp Support


- Partition Support


- IDE Reset method


- ATAPI support


- LBA48 support


- SCSI support


- NETWORK support(PCI and others)


- USB support


- MMC support


- Journaling Flash filesystem support


- Keyboard support


- Video support


- Keyboard support


- LCD support


- Splash Screen Support


- Gzip compressed BMP image support


- Compression support


- MII/PHY support


- Ethernet address


- IP address


- Server IP address


- Boot Recovery mode


- DHCP Advanded options


- CDP options


- Status LED


- CAN support


- I2C support


- SPI support


- FPGA support


- Configuration management


- Vendor Parameter protection


- Protected RAM


- Error Recovery


- Command Interpreter


- Default Environment


- DataFlash Support


- SystemACE Support


- TFTP Fixed UDP Port


- Show boot progress


Modem Support:





- Modem support enable: CONFIG_MODEM_SUPPORT


- RTS/CTS Flow control enable: CONFIG_HWFLOW


- Modem debug support


- Interrupt support(PPC): interrupt_init()timer_interrupt()對于所有PPC架構來說都是通用的。其中,interrupt_init()呼叫interrupt_init_cpu()對特定CPU進行起始化。在interrupt_init_cpu()中,應設定合適的decrement_count值。timer_interrupt()呼叫timer_interrupt_cpu()處理特定的CPU定時。如果板上有watchdog/status_led等,在timer_interrupt()后有效。


- General


Configuration Settings:


- CFG_LONGHELP


- CFG_PROMPT


- CFG_CBSIZE


- CFG_PBSIZE


- CFG_MAXARGS


- CFG_BARGSIZE


- CFG_BAUDRATE_TABLE


- CFG_CONSOLE_INFO_QUITE


- CFG_CONSOLE_IS_IN_ENV


- CFG_CONSOLE_ENV_OVERWRITE


- CFG_MEMTEST_START, CFG_MEMTEST_END


- CFG_ALT_MEMTEST


- CFG_MEMTEST_SCRATCH


- CFG_TFTP_LOADADDR


- CFG_LOADS_BAUD_CHANGE


- CFG_SDRAM_BASE


- CFG_MBIO_BASE


- CFG_FLASH_BASE


- CFG_MONITOR_BASE


- CFG_MONITOR_LEN


- CFG_MALLOC_LEN


- CFG_BOOTMAPSZ


- CFG_MAX_FLASH_BANKS


- CFG_MAX_FLASH_SECT


- CFG_FLASH_ERASE_TOUT


- CFG_FLASH_WRITE_TOUT


- CFG_FLASH_LOCK_TOUT


- CFG_FLASH_UNLOCK_TOUT


- CFG_FLASH_PROTECTION


- CFG_DIRECT_FLASH_TFTP


- CFG_FLASH_CFI


- CFG_FLASH_CFI_DRIVER


- CFG_FLASH_QUIET_TEST


- CFG_RX_ETH_BUFFER


- CFG_ENV_IS_IN_FLASH


- CFG_ENV_IS_IN_NVRAM


- CFG_ENV_IS_IN_EEPROM


- CFG_ENV_IS_IN_NAND


- CFG_SPI_INIT_OFFSET


- CFG_FAULT_ECHO_LINK_DOWN


Low Level (hardware related) configuration options:



- CFG_CACHELINE_SIZE


- CFG_DEFAULT_IMMR


- Floppy Disk Support


- CFG_IMMR: Internal Memory的實體位址


- CFG_INIT_RAM_ADDR:可用于初時資料或堆疊的儲存起始位址


- CFG_GBL_DATA_OFFSET:在由CFG_INIT_RAM_ADDR定義的記憶體中起始化資料的偏移


- CFG_SIUMCRSIU Module Configuration


- CFG_SYPCRSystem Protection Control


- CFG_TBSCRTime Base Status and Control


- CFG_PISCRPeriodic interrupt status and control


- CFG_PLPRCRPLL, Low-Power, and Reset Control Register


- CFG_SCCRSystem Clock and reset Control Register


- CFG_OR_TIMING_SDRAM


- CFG_MAMR_PTA


- CFG_DERDebug event register


- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,


- CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM, CFG_BR1_PRELIMMemory Controller DefinitionsBR0/1 and OR0/1(FLASH)


- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,


CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,


CFG_OR3_PRELIM, CFG_BR3_PRELIMMemory Controller DefinitionsBR2/3 and OR2/3(SDRAM)


- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K, CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COLMachine Mode Register and Memory Periodic Timer Prescaler definitionsSDRAM timing


- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]


- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:


- CFG_USE_OSCCLK


- CFG_CPM_POST_WORD_ADDR,CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB, CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL, CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,CFG_CPU_PCI_MEM_START,CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB, CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL, CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE, CFG_POCMR2_MASK_ATTRIB


- CONFIG_ETHER_ON_FEC


- CONFIG_FEC[12]_PHY


- CONFIG_FEC[12]_PHY_NORXERR


- CONFIG_RMII


- CONFIG_CRC32_VERIFY


- CONFIG_LOOPW


- CONFIG_MX_CYCLIC


- CONFIG_SKIP_LOWLEVEL_INIT


CONFIG_SKIP_RELOCATE_UBOOT



Buildin the Software:



U-BOOT已經在native PPC環境和交叉環境中測試過,包括在LinuxPPC 2000, RedHat Linux on x86, Solaries 2.6 on SPARCNetBSD 1.5 on x86。如果不是使用native PPC environment,那么則需要具有交叉編譯工具如前置“powerpc-linux-”等編譯器,鏈結器,elf檔案解析器等工具。這是需要重新定義Makefile中的CROSS_COMPILE。例如:CROSS_COMPILE = ppc_4xx-,此外,還需要制定U-Boot為特定的board type


make NAME_CONFIG


最后,執行


make all


來生成U-Boot images。生成的image包括:


u-boot.bin raw binary image


u-boot ELF格式的image


u-boot.srec Motorola(FreeScale)s-records format


此外,還需要注意,與GNU mkae不同,在NetBSD下應該使用"gmake"


U-Boot的移植




如果使用的platform不存在,則需要將U-BOOT進行移植。步驟如下:




1) 為使用的boardMakefileMAKEALL添加新的configuration option


2) 為使用的board新建一個新的目錄,該目錄下至少應該包含“Makefile”


.c”和“flash.c”及“u-boot.lds”


3) 執行“make _config”


4) 執行“make”,則會生成“u-boot.srec” image


5Debug and test

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