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diff --git a/roms/u-boot-sam460ex/doc/README.omap3 b/roms/u-boot-sam460ex/doc/README.omap3 new file mode 100644 index 000000000..6227151f8 --- /dev/null +++ b/roms/u-boot-sam460ex/doc/README.omap3 @@ -0,0 +1,158 @@ + +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 |