This is a respository of my Raspberry Pi Baremetal Experiments
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sdcard_gpio_spi: demo of accessing sdcard through gpio in SPI mode
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sdcard_gpio_bus: demo of accessing sdcard through gpio in bus mode (standard mode)
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Prepare a sd card that holds raspbian OS and you don't need any more (Contents of the card may be destroyed by this demo. So, make sure to use a one that you can waste.)
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replace kernel.img in your raspberry pi boot sd card with the kernel.img here, and start raspberry pi
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You need UART connection to GPIO ports #14 and #15