Introduction
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============
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RK3328 key features we might use in U-Boot:
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* CPU: ARMv8 64bit quad-core Cortex-A53
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* IRAM: 36KB
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* DRAM: 4GB-16MB dual-channel
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* eMMC: support eMMC 5.0/5.1, suport HS400, HS200, DDR50
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* SD/MMC: support SD 3.0, MMC 4.51
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* USB: USB2.0 EHCI host port *2
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* Display: RGB/HDMI/DP/MIPI/EDP
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evb key features:
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* regulator: pwm regulator for CPU B/L
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* PMIC: rk808
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* debug console: UART2
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In order to support Arm Trust Firmware(ATF), we need to use the
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miniloader from rockchip which:
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* do DRAM init
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* load and verify ATF image
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* load and verify U-Boot image
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Here is the step-by-step to boot to U-Boot on rk3328.
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Get the Source and prebuild binary
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==================================
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> mkdir ~/evb_rk3328
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> cd ~/evb_rk3328
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> git clone https://github.com/ARM-software/arm-trusted-firmware.git
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> git clone https://github.com/rockchip-linux/rkbin
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> git clone https://github.com/rockchip-linux/rkflashtool
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Compile ATF
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===============
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> cd arm-trusted-firmware
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> make realclean
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> make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3328 bl31
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Compile U-Boot
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==================
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> cd ../u-boot
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> make CROSS_COMPILE=aarch64-linux-gnu- evb-rk3328_defconfig all
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Compile rkflashtool
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=======================
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> cd ../rkflashtool
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> make
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Package image for miniloader
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================================
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> cd ..
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> cp arm-trusted-firmware/build/rk3328/release/bl31.bin rkbin/rk33
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> ./rkbin/tools/trust_merger rkbin/tools/RK3328TRUST.ini
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> ./rkbin/tools/loaderimage --pack --uboot u-boot/u-boot-dtb.bin uboot.img
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> mkdir image
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> mv trust.img ./image/
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> mv uboot.img ./image/rk3328evb-uboot.bin
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Flash image
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===============
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Power on(or reset with RESET KEY) with MASKROM KEY preesed, and then:
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> ./rkflashtool/rkflashloader rk3328evb
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You should be able to get U-Boot log message in console/UART2 now.
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