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AM335x SPI Boot时间问题



想用SPI Boot,把x-loader和u-boot放在SPI Flash上,kernel和文件系统在eMMC上;请问从系统Power On到u-boot载入到内存开始运行,大概需要多少时间?给个范围就可以:小于500ms,大约1S,小于3S,大于3S?

我在e2e论坛里看到有人说x-loader spi载入u-boot特别慢,所以想动手之前了解一下慢到什么程度,还有没有实用价值。