[N9H30] How to load app to RAM address 0x0 from SPI flash?
Posted: 07 Jan 2021, 17:11
Symptom: cannot utilize uboot to load app to RAM address 0x0 from SPI flash.
It's uboot limitation, and workaround approached are shown below:
Workaround 1: change app execution address from 0x0 to 0x8000.
*If you don't want to change app execution address*
Workaround 2: utilize uboot CPU memory command.
Note that uboot basic command set https://www.denx.de/wiki/view/U-Bootdoc/BasicCommandSet
Code: Select all
sf read 0x0 0x100000 0x700000Workaround 1: change app execution address from 0x0 to 0x8000.
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sf read 0x8000 0x100000 0x700000Workaround 2: utilize uboot CPU memory command.
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First read 0x1000 to DRAMCode: Select all
Next read (0x700000 - 0x1000) to DRAMCode: Select all
sf read 0x800000 0x100000 0x1000Code: Select all
cp.b 0x800000 0x0 0x1000Code: Select all
sf read 0x1000 0x101000 0x700000