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* 'master' of git://git.denx.de/u-boot-arm: tegra2: Optimize out-of-tree build for Ventana. tegra: Move boards over to use arch-level board UART function tegra: Add support for UART init in cpu board.c tegra: Add a function mux feature tegra: add clock_ll_start_uart() to enable UART prior to reloc tegra: Move clock_early_init() to arch_cpu_init() tegra: Move cpu_init_cp15() to arch_cpu_init() arm: Tegra: Fix Harmony and Ventana builds in u-boot-tegra/master tegra: Fix build error in plutux, medcom tegra2: Add Avionic Design Medcom support. tegra2: Add Avionic Design Plutux support. tegra2: Add common Avionic Design Tamonten support. tegra2: Move tegra2_mmc_init() prototype to public header. tegra2: Change CONFIG_SYS_TEXT_BASE to 0x00108000. tegra2: Always build with USE_PRIVATE_LIBGCC=yes. tegra2: Plumb in SPI/UART switch code tegra2: spi: Support SPI / UART switch tegra2: Implement SPI / UART GPIO switch tegra2: Enable SPI environment on Seaboard tegra2: config: Enable SPI flash on Seaboard tegra2: spi: Add SPI driver for Tegra2 SOC tegra2: Add UARTB support tegra2: Tidy UART selection arm, davinci: Fix build warnings for cam_enc_4xx Devkit8000: Switch over to enable_gpmc_cs_config arm, davinci: Add support for generating AIS images to the Makefile mkimage: Fix variable length header support arm, da850evm: Add an SPL for SPI boot arm, davinci: Add SPL support for DA850 SoCs sf: Add spi_boot() to allow booting from SPI flash in an SPL spl: display_options.o is required for SPI flash support in SPL ARM: omap3: add support to Technexion twister board ARM: omap3: added common configuration for Technexion TAM3517 vision2: Fix checkpatch warning
Storage of the board specific values (ethaddr...) ------------------------------------------------- The board specific environment variables that should be unique for each individual board, can be stored in the I2C EEPROM. This will be done from offset 0x80 with the length of 0x80 bytes. The following command can be used to store the values here: => setdef de:20:6a:ed:e2:72 de:20:6a:ed:e2:73 AB0001 ethaddr eth1addr serial# Now those 3 values are stored into the I2C EEPROM. A CRC is added to make sure that the values get not corrupted. SW-Reset Pushbutton handling: ----------------------------- The SW-reset push button is connected to a GPIO input too. This way U-Boot can "see" how long the SW-reset was pressed, and a specific action can be taken. Two different actions are supported: a) Release after more than 5 seconds and less then 10 seconds: -> Run POST Please note, that the POST test will take a while (approx. 1 min on the 128MByte board). This is mainly due to the system memory test. b) Release after more than 10 seconds: -> Restore factory default settings The factory default values are restored. The default environment variables are restored (ipaddr, serverip...) and the board specific values (ethaddr, eth1addr and serial#) are restored to the environment from the I2C EEPROM. Also a bootline parameter is added to the Linux bootline to signal the Linux kernel upon the next startup, that the factory defaults should be restored. The command to check this sw-reset status and act accordingly is => chkreset This command is added to the default "bootcmd", so that it is called automatically upon startup. Also, the 2 LED's are used to indicate the current status of this command (time passed since pushing the button). When the POST test will be run, the green LED will be switched off, and when the factory restore will be initiated, the reg LED will be switched off. Loggin of POST results: ----------------------- The results of the POST tests are logged in a logbuffer located at the end of the onboard memory. It can be accessed with the U-Boot command "log": => log show <4>POST memory PASSED <4>POST cache PASSED <4>POST cpu PASSED <4>POST uart PASSED <4>POST ethernet PASSED The DENX Linux kernel tree has support for this log buffer included. Exactly this buffer is used for logging of all kernel messages too. By enabling the compile time option "CONFIG_LOGBUFFER" this support is enabled. This way you can access the U-Boot log messages from Linux too. 2007-08-10, Stefan Roese <sr@denx.de>