X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-uboot.git;a=blobdiff_plain;f=README;h=b1b3e1788ec92d8ba088dab91175dfb1a44e2e26;hp=a35ef318da100b51f66c5515f6660fa2014ed90a;hb=a19b0dd62d7b8efc658fa1aa685ff5665878f3ee;hpb=412665b46134f93464c09405e02f08ac9c62526d diff --git a/README b/README index a35ef318da..b1b3e1788e 100644 --- a/README +++ b/README @@ -201,7 +201,6 @@ Directory Hierarchy: /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 /mpc85xx Files specific to Freescale MPC85xx CPUs @@ -496,6 +495,13 @@ The following options need to be configured: exists, unlike the similar options in the Linux kernel. Do not set these options unless they apply! +- CPU timer options: + CONFIG_SYS_HZ + + The frequency of the timer returned by get_timer(). + get_timer() must operate in milliseconds and this CONFIG + option must be set to 1000. + - Linux Kernel Interface: CONFIG_CLOCKS_IN_MHZ @@ -627,14 +633,6 @@ The following options need to be configured: boot loader that has already initialized the UART. Define this variable to flush the UART at init time. - CONFIG_SYS_NS16550_BROKEN_TEMT - - 16550 UART set the Transmitter Empty (TEMT) Bit when all output - has finished and the transmitter is totally empty. U-Boot waits - for this bit to be set to initialize the serial console. On some - broken platforms this bit is not set in SPL making U-Boot to - hang while waiting for TEMT. Define this option to avoid it. - - Console Interface: Depending on board, define exactly one serial port @@ -845,6 +843,7 @@ The following options need to be configured: CONFIG_CMD_FDOS * Dos diskette Support CONFIG_CMD_FLASH flinfo, erase, protect CONFIG_CMD_FPGA FPGA device initialization support + CONFIG_CMD_FUSE Device fuse support CONFIG_CMD_GETTIME * Get time since boot CONFIG_CMD_GO * the 'go' command (exec code) CONFIG_CMD_GREPENV * search environment @@ -899,6 +898,7 @@ The following options need to be configured: CONFIG_CMD_SF * Read/write/erase SPI NOR flash CONFIG_CMD_SHA1SUM print sha1 memory digest (requires CONFIG_CMD_MEMORY) + CONFIG_CMD_SOFTSWITCH * Soft switch setting command for BF60x CONFIG_CMD_SOURCE "source" command Support CONFIG_CMD_SPI * SPI serial bus support CONFIG_CMD_TFTPSRV * TFTP transfer in server mode @@ -931,6 +931,13 @@ The following options need to be configured: XXX - this list needs to get updated! +- Regular expression support: + CONFIG_REGEX + If this variable is defined, U-Boot is linked against + the SLRE (Super Light Regular Expression) library, + which adds regex support to some commands, as for + example "env grep" and "setexpr". + - Device tree: CONFIG_OF_CONTROL If this variable is defined, U-Boot will use a device tree @@ -1337,6 +1344,29 @@ The following options need to be configured: CONFIG_SH_MMCIF_CLK Define the clock frequency for MMCIF +- USB Device Firmware Update (DFU) class support: + CONFIG_DFU_FUNCTION + This enables the USB portion of the DFU USB class + + CONFIG_CMD_DFU + This enables the command "dfu" which is used to have + U-Boot create a DFU class device via USB. This command + requires that the "dfu_alt_info" environment variable be + set and define the alt settings to expose to the host. + + CONFIG_DFU_MMC + This enables support for exposing (e)MMC devices via DFU. + + CONFIG_DFU_NAND + This enables support for exposing NAND devices via DFU. + + CONFIG_SYS_DFU_MAX_FILE_SIZE + When updating files rather than the raw storage device, + we use a static buffer to copy the file into and then write + the buffer once we've been given the whole file. Define + this to the maximum filesize (in bytes) for the buffer. + Default is 4 MiB if undefined. + - Journaling Flash filesystem support: CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, CONFIG_JFFS2_NAND_DEV @@ -1938,15 +1968,15 @@ CBFS (Coreboot Filesystem) support I2C_READ - Code that returns TRUE if the I2C data line is high, - FALSE if it is low. + Code that returns true if the I2C data line is high, + false if it is low. eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) I2C_SDA(bit) - If is TRUE, sets the I2C data line high. If it - is FALSE, it clears it (low). + If is true, sets the I2C data line high. If it + is false, it clears it (low). eg: #define I2C_SDA(bit) \ if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ @@ -1954,8 +1984,8 @@ CBFS (Coreboot Filesystem) support I2C_SCL(bit) - If is TRUE, sets the I2C clock line high. If it - is FALSE, it clears it (low). + If is true, sets the I2C clock line high. If it + is false, it clears it (low). eg: #define I2C_SCL(bit) \ if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ @@ -2776,6 +2806,32 @@ FIT uImage format: Adds the MTD partitioning infrastructure from the Linux kernel. Needed for UBI support. +- UBI support + CONFIG_CMD_UBI + + Adds commands for interacting with MTD partitions formatted + with the UBI flash translation layer + + Requires also defining CONFIG_RBTREE + + CONFIG_UBI_SILENCE_MSG + + Make the verbose messages from UBI stop printing. This leaves + warnings and errors enabled. + +- UBIFS support + CONFIG_CMD_UBIFS + + Adds commands for interacting with UBI volumes formatted as + UBIFS. UBIFS is read-only in u-boot. + + Requires UBI support as well as CONFIG_LZO + + CONFIG_UBIFS_SILENCE_MSG + + Make the verbose messages from UBIFS stop printing. This leaves + warnings and errors enabled. + - SPL framework CONFIG_SPL Enable building of SPL globally. @@ -2783,8 +2839,18 @@ FIT uImage format: CONFIG_SPL_LDSCRIPT LDSCRIPT for linking the SPL binary. + CONFIG_SPL_MAX_FOOTPRINT + Maximum size in memory allocated to the SPL, BSS included. + When defined, the linker checks that the actual memory + used by SPL from _start to __bss_end does not exceed it. + CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE + must not be both defined at the same time. + CONFIG_SPL_MAX_SIZE - Maximum binary size (text, data and rodata) of the SPL binary. + Maximum size of the SPL image (text, data, rodata, and + linker lists sections), BSS excluded. + When defined, the linker checks that the actual size does + not exceed it. CONFIG_SPL_TEXT_BASE TEXT_BASE for linking the SPL binary. @@ -2797,7 +2863,11 @@ FIT uImage format: Link address for the BSS within the SPL binary. CONFIG_SPL_BSS_MAX_SIZE - Maximum binary size of the BSS section of the SPL binary. + Maximum size in memory allocated to the SPL BSS. + When defined, the linker checks that the actual memory used + by SPL from __bss_start to __bss_end does not exceed it. + CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE + must not be both defined at the same time. CONFIG_SPL_STACK Adress of the start of the stack SPL will use @@ -2916,14 +2986,23 @@ FIT uImage format: Support for lib/libgeneric.o in SPL binary CONFIG_SPL_PAD_TO - Linker address to which the SPL should be padded before - appending the SPL payload. + Image offset to which the SPL should be padded before appending + the SPL payload. By default, this is defined as + CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. + CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL + payload without any padding, or >= CONFIG_SPL_MAX_SIZE. CONFIG_SPL_TARGET Final target image containing SPL and payload. Some SPLs use an arch-specific makefile fragment instead, for example if more than one image needs to be produced. + CONFIG_FIT_SPL_PRINT + Printing information about a FIT image adds quite a bit of + code to SPL. So this is normally disabled in SPL. Use this + option to re-enable it. This will affect the output of the + bootm command when booting a FIT image. + Modem Support: -------------- @@ -3183,6 +3262,15 @@ Configuration Settings: digits and dots. Recommended value: 45 (9..1) for 80 column displays, 15 (3..1) for 40 column displays. +- CONFIG_FLASH_VERIFY + If defined, the content of the flash (destination) is compared + against the source after the write operation. An error message + will be printed when the contents are not identical. + Please note that this option is useless in nearly all cases, + since such flash programming errors usually are detected earlier + while unprotecting/erasing/programming. Please only enable + this option if you really know what you are doing. + - CONFIG_SYS_RX_ETH_BUFFER: Defines the number of Ethernet receive buffers. On some Ethernet controllers it is recommended to set this value @@ -3258,6 +3346,10 @@ Configuration Settings: offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than directly. You should not need to touch this setting. +- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only) + This is set by OMAP boards for the max time that reset should + be asserted. See doc/README.omap-reset-time for details on how + the value can be calulated on a given board. The following definitions that deal with the placement and management of environment data (variable area); in general, we support the @@ -3492,6 +3584,33 @@ but it can not erase, write this NOR flash by SRIO or PCIE interface. environment. If redundant environment is used, it will be copied to CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. +- CONFIG_ENV_IS_IN_UBI: + + Define this if you have an UBI volume that you want to use for the + environment. This has the benefit of wear-leveling the environment + accesses, which is important on NAND. + + - CONFIG_ENV_UBI_PART: + + Define this to a string that is the mtd partition containing the UBI. + + - CONFIG_ENV_UBI_VOLUME: + + Define this to the name of the volume that you want to store the + environment in. + + - CONFIG_ENV_UBI_VOLUME_REDUND: + + Define this to the name of another volume to store a second copy of + the environment in. This will enable redundant environments in UBI. + It is assumed that both volumes are in the same MTD partition. + + - CONFIG_UBI_SILENCE_MSG + - CONFIG_UBIFS_SILENCE_MSG + + You will probably want to define these to avoid a really noisy system + when storing the env in UBI. + - CONFIG_SYS_SPI_INIT_OFFSET Defines offset to the initial SPI buffer area in DPRAM. The @@ -3763,9 +3882,13 @@ 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_NAND_BUSWIDTH_16BIT + Defined to tell the NAND controller that the NAND chip is using + a 16 bit bus. + Not all NAND drivers use this symbol. + Example of drivers that use it: + - drivers/mtd/nand/ndfc.c + - drivers/mtd/nand/mxc_nand.c - CONFIG_SYS_NDFC_EBC0_CFG Sets the EBC0_CFG register for the NDFC. If not defined @@ -4945,7 +5068,7 @@ On some platforms, it's possible to boot Linux zImage. This is done using the "bootz" command. The syntax of "bootz" command is the same as the syntax of "bootm" command. -Note, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply +Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply kernel with raw initrd images. The syntax is slightly different, the address of the initrd must be augmented by it's size, in the following format: ":".