Summary ======= This README is about U-Boot support for TI's ARM Cortex-A8 based OMAP3 [1] family of SoCs. TI's OMAP3 SoC family contains an ARM Cortex-A8. Additionally, some family members contain a TMS320C64x+ DSP and/or an Imagination SGX 2D/3D graphics processor and various other standard peripherals. Currently the following boards are supported: * OMAP3530 BeagleBoard [2] * Gumstix Overo [3] * TI EVM [4] * OpenPandora Ltd. Pandora [5] * TI/Logic PD Zoom MDK [6] * TI/Logic PD Zoom 2 [7] Toolchain ========= While ARM Cortex-A8 support ARM v7 instruction set (-march=armv7a) we compile with -march=armv5 to allow more compilers to work. For U-Boot code this has no performance impact. Build ===== * BeagleBoard: make omap3_beagle_config make * Gumstix Overo: make omap3_overo_config make * TI EVM: make omap3_evm_config make * Pandora: make omap3_pandora_config make * Zoom MDK: make omap3_zoom1_config make * Zoom 2: make omap3_zoom2_config make Custom commands =============== To make U-Boot for OMAP3 support NAND device SW or HW ECC calculation, U-Boot for OMAP3 supports custom user command nandecc hw/sw To be compatible with NAND drivers using SW ECC (e.g. kernel code) nandecc sw enables SW ECC calculation. HW ECC enabled with nandecc hw is typically used to write 2nd stage bootloader (known as 'x-loader') which is executed by OMAP3's boot rom and therefore has to be written with HW ECC. For all other commands see help Interfaces ========== gpio To set a bit : if (!omap_request_gpio(N)) { omap_set_gpio_direction(N, 0); omap_set_gpio_dataout(N, 1); } To clear a bit : if (!omap_request_gpio(N)) { omap_set_gpio_direction(N, 0); omap_set_gpio_dataout(N, 0); } To read a bit : if (!omap_request_gpio(N)) { omap_set_gpio_direction(N, 1); val = omap_get_gpio_datain(N); omap_free_gpio(N); } if (val) printf("GPIO N is set\n"); else printf("GPIO N is clear\n"); Acknowledgements ================ OMAP3 U-Boot is based on U-Boot tar ball [8] for BeagleBoard and EVM done by several TI employees. Links ===== [1] OMAP3: http://www.ti.com/omap3 (high volume) and http://www.ti.com/omap35x (broad market) [2] OMAP3530 BeagleBoard: http://beagleboard.org/ [3] Gumstix Overo: http://www.gumstix.net/Overo/ [4] TI EVM: http://focus.ti.com/docs/toolsw/folders/print/tmdxevm3503.html [5] OpenPandora Ltd. Pandora: http://openpandora.org/ [6] TI/Logic PD Zoom MDK: http://www.logicpd.com/products/devkit/ti/zoom_mobile_development_kit [7] TI/Logic PD Zoom 2 http://www.logicpd.com/sites/default/files/1012659A_Zoom_OMAP34x-II_MDP_Brief.pdf [8] TI OMAP3 U-Boot: http://beagleboard.googlecode.com/files/u-boot_beagle_revb.tar.gz