X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=README;h=0886987a6003a09bfa58f05a1935a6f399d47ca8;hb=fa82f871c8dbc9a15e8dc274b3f99dd5fa0da458;hp=446966dc16f5dc353daed8ede6b4e26ea997dafa;hpb=9623c158f6a5150a21c25026bfba79e7ff7912f5;p=oweals%2Fu-boot.git diff --git a/README b/README index 446966dc16..0886987a60 100644 --- a/README +++ b/README @@ -147,7 +147,7 @@ Directory Hierarchy: /cpu CPU specific files /arm720t Files specific to ARM 720 CPUs /arm920t Files specific to ARM 920 CPUs - /at91rm9200 Files specific to Atmel AT91RM9200 CPU + /at91 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 @@ -180,6 +180,7 @@ Directory Hierarchy: /lib Architecture specific library files /mips Files generic to MIPS architecture /cpu CPU specific files + /mips32 Files specific to MIPS32 CPUs /lib Architecture specific library files /nios2 Files generic to Altera NIOS2 architecture /cpu CPU specific files @@ -382,6 +383,38 @@ The following options need to be configured: 2. The core frequency as calculated above is multiplied by this value. +- MIPS CPU options: + CONFIG_SYS_INIT_SP_OFFSET + + Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack + pointer. This is needed for the temporary stack before + relocation. + + CONFIG_SYS_MIPS_CACHE_MODE + + Cache operation mode for the MIPS CPU. + See also arch/mips/include/asm/mipsregs.h. + Possible values are: + CONF_CM_CACHABLE_NO_WA + CONF_CM_CACHABLE_WA + CONF_CM_UNCACHED + CONF_CM_CACHABLE_NONCOHERENT + CONF_CM_CACHABLE_CE + CONF_CM_CACHABLE_COW + CONF_CM_CACHABLE_CUW + CONF_CM_CACHABLE_ACCELERATED + + CONFIG_SYS_XWAY_EBU_BOOTCFG + + Special option for Lantiq XWAY SoCs for booting from NOR flash. + See also arch/mips/cpu/mips32/start.S. + + CONFIG_XWAY_SWAP_BYTES + + Enable compilation of tools/xway-swap-bytes needed for Lantiq + XWAY SoCs for booting from NOR flash. The U-Boot image needs to + be swapped if a flash programmer is used. + - Linux Kernel Interface: CONFIG_CLOCKS_IN_MHZ @@ -442,6 +475,16 @@ The following options need to be configured: crash. This is needed for buggy hardware (uc101) where no pull down resistor is connected to the signal IDE5V_DD7. + CONFIG_MACH_TYPE [relevant for ARM only][mandatory] + + This setting is mandatory for all boards that have only one + machine type and must be used to specify the machine type + number as it appears in the ARM machine registry + (see http://www.arm.linux.org.uk/developer/machines/). + Only boards that have multiple machine types supported + in a single configuration file and the machine type is + runtime discoverable, do not have to use this setting. + - vxWorks boot parameters: bootvx constructs a valid bootline using the following @@ -460,6 +503,17 @@ The following options need to be configured: Note: If a "bootargs" environment is defined, it will overwride the defaults discussed just above. +- Cache Configuration: + CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot + CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot + CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot + +- Cache Configuration for ARM: + CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache + controller + CONFIG_SYS_PL310_BASE - Physical base address of PL310 + controller register space + - Serial Ports: CONFIG_PL010_SERIAL @@ -1043,6 +1097,15 @@ The following options need to be configured: enabled with CONFIG_CMD_MMC. The MMC driver also works with the FAT fs. This is enabled with CONFIG_CMD_FAT. + CONFIG_SH_MMCIF + Support for Renesas on-chip MMCIF controller + + CONFIG_SH_MMCIF_ADDR + Define the base address of MMCIF registers + + CONFIG_SH_MMCIF_CLK + Define the clock frequency for MMCIF + - Journaling Flash filesystem support: CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, CONFIG_JFFS2_NAND_DEV @@ -1693,12 +1756,12 @@ The following options need to be configured: => If you now switch to the new I2C Bus 3 with "i2c dev 3" - u-boot sends First the Commando to the mux@70 to enable - channel 6, and then the Commando to the mux@71 to enable + u-boot first sends the command to the mux@70 to enable + channel 6, and then the command to the mux@71 to enable the channel 4. After that, you can use the "normal" i2c commands as - usual, to communicate with your I2C devices behind + usual to communicate with your I2C devices behind the 2 muxes. This option is actually implemented for the bitbanging @@ -2225,6 +2288,45 @@ FIT uImage format: Adds the MTD partitioning infrastructure from the Linux kernel. Needed for UBI support. +- SPL framework + CONFIG_SPL + Enable building of SPL globally. + + CONFIG_SPL_TEXT_BASE + TEXT_BASE for linking the SPL binary. + + CONFIG_SPL_LDSCRIPT + LDSCRIPT for linking the SPL binary. + + CONFIG_SPL_LIBCOMMON_SUPPORT + Support for common/libcommon.o in SPL binary + + CONFIG_SPL_LIBDISK_SUPPORT + Support for disk/libdisk.o in SPL binary + + CONFIG_SPL_I2C_SUPPORT + Support for drivers/i2c/libi2c.o in SPL binary + + CONFIG_SPL_GPIO_SUPPORT + Support for drivers/gpio/libgpio.o in SPL binary + + CONFIG_SPL_MMC_SUPPORT + Support for drivers/mmc/libmmc.o in SPL binary + + CONFIG_SPL_SERIAL_SUPPORT + Support for drivers/serial/libserial.o in SPL binary + + CONFIG_SPL_SPI_FLASH_SUPPORT + Support for drivers/mtd/spi/libspi_flash.o in SPL binary + + CONFIG_SPL_SPI_SUPPORT + Support for drivers/spi/libspi.o in SPL binary + + CONFIG_SPL_FAT_SUPPORT + Support for fs/fat/libfat.o in SPL binary + + CONFIG_SPL_LIBGENERIC_SUPPORT + Support for lib/libgeneric.o in SPL binary Modem Support: -------------- @@ -2494,6 +2596,11 @@ The following definitions that deal with the placement and management of environment data (variable area); in general, we support the following configurations: +- CONFIG_BUILD_ENVCRC: + + Builds up envcrc with the target environment so that external utils + may easily extract it and embed it in final U-Boot images. + - CONFIG_ENV_IS_IN_FLASH: Define this if the environment is in flash memory. @@ -2917,6 +3024,14 @@ Low Level (hardware related) configuration options: - CONFIG_SYS_SRIOn_MEM_SIZE: Size of SRIO port 'n' memory region +- CONFIG_SYS_NDFC_16 + Defined to tell the NDFC that the NAND chip is using a + 16 bit bus. + +- CONFIG_SYS_NDFC_EBC0_CFG + Sets the EBC0_CFG register for the NDFC. If not defined + a default value will be used. + - CONFIG_SPD_EEPROM Get DDR timing information from an I2C EEPROM. Common with pluggable memory modules such as SODIMMs @@ -2929,6 +3044,12 @@ Low Level (hardware related) configuration options: one, specify here. Note that the value must resolve to something your driver can deal with. +- CONFIG_SYS_DDR_RAW_TIMING + Get DDR timing information from other than SPD. Common with + soldered DDR chips onboard without SPD. DDR raw timing + parameters are extracted from datasheet and hard-coded into + header files or board specific files. + - CONFIG_SYS_83XX_DDR_USES_CS0 Only for 83xx systems. If specified, then DDR should be configured using CS0 and CS1 instead of CS2 and CS3. @@ -2982,7 +3103,7 @@ Low Level (hardware related) configuration options: globally (CONFIG_CMD_MEM). - CONFIG_SKIP_LOWLEVEL_INIT - [ARM only] If this variable is defined, then certain + [ARM, MIPS only] If this variable is defined, then certain low level initializations (like setting up the memory controller) are omitted and/or U-Boot does not relocate itself into RAM. @@ -2992,7 +3113,7 @@ Low Level (hardware related) configuration options: other boot loader or by a debugger which performs these initializations itself. -- CONFIG_PRELOADER +- CONFIG_SPL_BUILD Modifies the behaviour of start.S when compiling a loader that is executed before the actual U-Boot. E.g. when compiling a NAND SPL. @@ -3280,6 +3401,15 @@ List of environment variables (most likely not complete): This can be used to load and uncompress arbitrary data. + fdt_high - if set this restricts the maximum address that the + flattened device tree will be copied into upon boot. + If this is set to the special value 0xFFFFFFFF then + the fdt will not be copied at all on boot. For this + to work it must reside in writable memory, have + sufficient padding on the end of it for u-boot to + add the information it needs into it, and the memory + must be accessible by the kernel. + i2cfast - (PPC405GP|PPC405EP only) if set to 'y' configures Linux I2C driver for fast mode (400kHZ). This environment variable is used in @@ -4382,9 +4512,7 @@ Coding Standards: All contributions to U-Boot should conform to the Linux kernel coding style; see the file "Documentation/CodingStyle" and the script -"scripts/Lindent" in your Linux kernel source directory. In sources -originating from U-Boot a style corresponding to "Lindent -pcs" (adding -spaces before parameters to function calls) is actually used. +"scripts/Lindent" in your Linux kernel source directory. Source files originating from a different project (for example the MTD subsystem) are generally exempt from these guidelines and are not @@ -4397,9 +4525,9 @@ in your code. Please also stick to the following formatting rules: - remove any trailing white space -- use TAB characters for indentation, not spaces +- use TAB characters for indentation and vertical alignment, not spaces - make sure NOT to use DOS '\r\n' line feeds -- do not add more than 2 empty lines to source files +- do not add more than 2 consecutive empty lines to source files - do not add trailing empty lines to source files Submissions which do not conform to the standards may be returned @@ -4433,14 +4561,14 @@ it: * For major contributions, your entry to the CREDITS file * When you add support for a new board, don't forget to add this - board to the MAKEALL script, too. + board to the MAINTAINERS file, too. * If your patch adds new configuration options, don't forget to document these in the README file. * The patch itself. If you are using git (which is *strongly* recommended) you can easily generate the patch using the - "git-format-patch". If you then use "git-send-email" to send it to + "git format-patch". If you then use "git send-email" to send it to the U-Boot mailing list, you will avoid most of the common problems with some other mail clients.