[N9H30] How to load app to RAM address 0x0 from SPI flash?

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9chuckyoung
Posts: 88
Joined: 28 Jan 2019, 13:49

07 Jan 2021, 17:11

Symptom: cannot utilize uboot to load app to RAM address 0x0 from SPI flash.

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sf read 0x0 0x100000 0x700000
It's uboot limitation, and workaround approached are shown below:

Workaround 1: change app execution address from 0x0 to 0x8000.

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sf read 0x8000 0x100000 0x700000
*If you don't want to change app execution address*
Workaround 2: utilize uboot CPU memory command.

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First read 0x1000 to DRAM

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Next read (0x700000 - 0x1000) to DRAM

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sf read 0x800000 0x100000 0x1000

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cp.b 0x800000 0x0 0x1000

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sf read 0x1000 0x101000 0x700000
Note that uboot basic command set https://www.denx.de/wiki/view/U-Bootdoc/BasicCommandSet

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