mirror of
https://github.com/armbian/mtkbin.git
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63 lines
2.6 KiB
Markdown
63 lines
2.6 KiB
Markdown
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# Mediatek binaries
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## Why?
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This repo contains prebuilt binaries provided by Mediatek (or board vendors) for use with their platforms.
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The sources for these binaries are not publicly available, but Mediatek (or boards vendors) provide them as compiled
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binaries.
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This repo is consumed by `armbian/build` framework to build a full boot stack for specific boards; as such it is not
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meant for end-users.
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# What?
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### `libdram`
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This is a DRAM initialization library used by U-Boot and ATF to initialize the DRAM memory controller on Mediatek
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platforms.
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It is provided as `.a` only (thus subject to ABI compatibility) and linked into TF-A/ATF build.
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Mediatek publishes binaries in their GitLab repository: https://gitlab.com/mediatek/aiot/rity/libdram-prebuilt.git
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Here we have organized them, per-board, for easier use and with a GitHub mirror.
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### `libbase`
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This is a low-level hardware abstraction library for Mediatek platforms.
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It is provided as `.a` only (thus subject to ABI compatibility) and linked into TF-A/ATF build.
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Mediatek publishes binaries in their GitLab repository: https://gitlab.com/mediatek/aiot/bsp/libbase-prebuilt.git
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Here we have organized them, per-board, for easier use and with a GitHub mirror.
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### `Little Kernel (LK)`
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The Little Kernel (LK) is a lightweight `fastboot` compatible bootloader used on Mediatek platforms.
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Mediatek publishes builds in their GitLab repository: https://gitlab.com/mediatek/aiot/rity/lk-prebuilt.git but only
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for their development kits. Board vendors (or Mediatek themselves) provide prebuilt `lk.bin` files for other boards.
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The upstream is here: https://github.com/littlekernel/lk - but Mediatek apparently heavily modifies it with no public
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source code available.
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It plays a similar role to Rockchip's `spl_loader` blob: the SoC loads it from USB OTG (similar to Rockchip's "Markrom"
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USB).
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The `lk.bin` itself contains all the BLxx bits (thus probably also `libdram` and `libbase`) plus a final payload
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that implements `fastboot` protocol over OTG, allowing users to flash FIP images and disk images to eMMC/UFS storage.
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It is an essential part of the flashing process for Mediatek boards, but is not required for normal booting.
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# Directory organization
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The prebuilt binaries are organized in directories per-board, with each directory containing the relevant
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`.a` files for `libdram` and `libbase`, and the `lk.bin` file for Little Kernel.
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There might be variants for different storage types (eMMC, UFS) or board revisions.
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In the case of Little Kernel, there might be more than one variant per board, and armbian/build selects one based
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on trial and error.
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Look into each board directory for details.
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