Rebuilding u-boot for Cyrus
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The Cyrus defconfigs are Cyrus_P5020_defconfig and Cyrus_P5040_defconfig.
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They currently disable size optimization in order to avoid a relocation
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bug in some versions of GCC. As the output size is a constant, the size
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optimization is not currently important.
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Cyrus boots off a microSD card in a slot on the motherboard. This requires
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that the u-boot is built for the Pre-Boot Loader on the P5020/P5040.
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In order to reflash u-boot, you must download u-boot.pbl, then write it
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onto the card. To do that from u-boot:
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> tftp 1000000 u-boot.pbl
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> mmc write 1000000 8 672
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If you want to do this via a card reader in linux:
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> dd if=u-boot.pbl of=/dev/sdX bs=512 oseek=8
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