29 lines
1.6 KiB
Markdown
29 lines
1.6 KiB
Markdown
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Helios64 supports at least **3 (TBD)** boot modes that can be chosen by using the jumper configuration.
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The default Boot device order for Helios64 is the SPI Flash Memory, eMMC, then micro-SD Card.
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The SoC will access this order sequentially to find the bootloader in all possible storage medium.
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To change the boot order if the bootloader are present in all possible volatile storage, we can use the combination of P10 and P11 jumpers.
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(Please see above figure for the connector/interface list.)
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Following jumper are available in the Helios64 board to configure the boot modes:
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- P11 jumper can be used disable SPI Flash, when this jumper is shorted/close it means disable boot from the SPI Flash, and the board will search the next boot device (which is eMMC).
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- P10 jumper is available to disable eMMC boot, when this jumper is closed Helios64 wil skip looking for bootloader from the eMMC and will continue with the micro-SD card,
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So you can select to search for bootloader starting from the SPI Flash Storage, eMMC, untill micro-SD card.
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Following table may simplified boot ordering by jumper config by assuming the bootloaders are present in every storage device:
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P11 State|P10 State|Boot Order|Notes
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-----|---------------|--------------|-------
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0|0|SPI Flash|-
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1|0|eMMC|-
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1|1|micro-SD Card|-
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!!! note
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Please note, in case of bootloader is not present in the storage devices. The SoC will search to the next possible boot device.
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All the ready-to-use images we provide are for the **SD Card** boot mode.
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Please refer to [U-boot](/helios4/uboot) section to know how to use the other modes.
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