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What is the method to calculate these parameters in uboot ? :

bootm_low=0 bootm_size=7ff00000 fdt_addr_r=0x40000000 fdt_high=0x100000 fdt_size_r=0x400000 fdtcontroladdr=7bc971c0 kernel_addr_r=0x18000000 kernel_comp_addr_r=0x30000000 kernel_comp_size=0x3C00000 kernel_size_r=0x10000000 loadaddr=0x8000000 pxefile_addr_r=0x10000000 ramdisk_addr_r=0x02100000

My boot command :

fatload mmc 0:1 $kernel_addr_r Image.gz fatload mmc 0:1 $fdt_addr_r system.dtb booti $kernel_addr_r - $fdt_addr_r

I have 4G or DRAM on an A53. My kernel has different behavior when I change one of these parameter.

I also use the fdt_high parameter because I can't boot my kernel without but I don't know how to calculate the right value.

Thanks for help

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2 Answers 2

Reset to default
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You shouldn't be setting all of those, and not all of them are needed just to load and boot a kernel. See the documentation at https://u-boot.readthedocs.io/en/latest/usage/environment.html for what these mean, and look at other examples for your specific SoC to likely find reasonable defaults to use.

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Solved. It was a RAM configuration issue. I have 2GB, not 4GB.

I changed the memory section in device tree and I use the default address values in uboot parameters and it works.

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