62 lines
2.5 KiB
Markdown
62 lines
2.5 KiB
Markdown
## Boot Mode (P10 & P11)
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Helios64 SoC supports 3 boot modes that can be chosen by jumper configuration.
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The default boot device order is:
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1. SPI Flash
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2. eMMC Flash
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3. micro-SD Card
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The SoC will access sequentially the above devices until it finds a bootloader code. To change the boot order if a bootloader code is present on more then one device, we can use the combination of P10 and P11 jumpers to force SoC to skip devices.
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- P11 jumper can be used to disable SPI Flash, when this jumper is shorted SoC will skip looking for bootloader on SPI Flash and will continue with the EMMC Flash.
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- P10 jumper can be used to disable eMMC Flash, when this jumper is shorted SoC will skip looking for bootloader on eMMC Flash and will continue with the micro-SD card.
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The following logic table gives a simplified view of boot order configuration by jumper, assuming bootloader code is present on each 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 Flash | - |
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| 1 | 1 | micro-SD Card | - |
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## USB Console/Recovery Mode (P13)
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This jumper controls a 2:1 MUX switching the USB2.0 lanes of the Type-C port (J15) between the SoC Type-C interface and the USB-to-Serial bridge. For more details refer to the [USB Type-C section](/helios64/usb/#usb-on-helios64).
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* When the jumper is opened the Type-C port (J15) can be used to connect to the serial console of the Helios64.
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* When closed and system in recovery mode, the Type-C port (J15) can be used to flash directly the eMMC over USB.
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## DC-IN Priority (P15)
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Helios64 supports 2x different DC-IN 12V inputs :
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* AC Adapter (J16)
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* ATX PSU (J10)
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You can plug both DC-IN inputs in order to have a failover setup that automatically switches to the other input if the first one fails. Jumpers P15 can be used to force ATX as master DC-IN input.
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| P15 | Description |
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|-----|-------------|
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| Open | O-Ring Connection |
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| Close | Set ATX Priority |
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## SATA Controller Flash (P8)
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Reserved for production.
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## eFuse Power Enable (P9)
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When shorted this jumper will allow user to burn efuse data in order to configure secure boot.
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!!! warning
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Wrong efuse data can bricked Helios64 which cannot be repaired. Do **NOT** short this jumper if you don't know what you are doing.
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