63 lines
1.5 KiB
Markdown
63 lines
1.5 KiB
Markdown
Kobol Helios64
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==============
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The `default.nix` module provides the required setup for the system to work.
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The `recommended.nix` module adds recommended settings for the system.
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Status
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------
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### Works
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- SATA hard drives
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- Ethernet (1gbps)
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- Serial through USB type-c (`ttyS2`)
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### Untested
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- Ethernet (2.5gbps)
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- DP video out
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- UPS behaviour
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- `rootfs` on SATA drives
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### Disabled
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Due to misbehaviour, `ttyS0` (`&uart0`, `serial@ff180000`) has been disabled
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via a kernel patch.
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Without this change, using, or attempting to use `ttyS0` will break serial
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output from `ttyS2`.
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Kernel
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------
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Only Linux 5.10 (LTS) is supported, using the patch set derived from Armbian.
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Requirements
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------------
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A *platform firmware* needs to be provided out of band for the system.
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The author recommends Tow-Boot, for which a [draft pull request](https://github.com/Tow-Boot/Tow-Boot/pull/54)
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adds support for the Helios64.
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Any other supported *platform firmware* should work too.
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> **NOTE**: at the time of writing (2021-10-10) the *platform firmware*
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> **must** make use of the proprietary ram training. The open source equivalent
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> will make the system unstable, and worse, will cause silent memory
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> corruption, in addition to loud memory corruption.
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Notes
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-----
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### Baud rate
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The serial baud rate is configured for `115200`, which is a more common default
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than the usual for Rockchip at `1500000`. See [the rationale for the decision](https://github.com/Tow-Boot/Tow-Boot/pull/33).
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