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board: some sim card help on the bpi-r4

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Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
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Joachim Wiberg
2026-06-07 20:50:28 +02:00
parent 43bf6358a0
commit 060e0ea284
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board/aarch64/bananapi-bpi-r4/README.md
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@@ -87,6 +87,45 @@ Infix ships with the following factory defaults.
> are bridged into the LAN as access points. WiFi is not included with the board
> and is not part of the factory default configuration.
## SIM Card Installation
The BPI-R4 has three SIM holders, one per PCIe slot:
| Slot | PCIe socket | Typical use |
|----------|-------------|--------------------------|
| **SIM1** | M.2 Key-B | 4G/5G WWAN modem |
| **SIM2** | mPCIe #1 | Cellular or other modem |
| **SIM3** | mPCIe #2 | Cellular or other modem |
All three take **nano-SIM (4FF)** cards.
> [!NOTE]
> The official Banana Pi pages show an older board revision with a sliding
> "sled" holder. Newer boards ship with a fixed friction-fit holder instead:
> there is no lid to lift and no spring eject. The [closest matching photo on
> bananapi.org][15] shows the current mechanism.
### Inserting a SIM
1. Orient the card with the gold contacts facing the PCB (printed
side up) and the cut corner pointing toward the M.2/mPCIe socket,
which on this board is also toward the outer edge. The silkscreen
next to each holder shows the same outline.
2. Push the SIM straight in until it is fully seated. There is no
click and the holder is not spring-loaded, so press firmly until
the contacts engage and the rear edge of the card sits flush with
the holder.
3. A SIM that still protrudes is not fully inserted; push again.
### Removing a SIM
The friction grip on these holders is tight. Gently pry the card out
with a fingernail or a thin plastic spudger. Avoid metal tweezers
near the contacts. Removing the front panel of the metal case is
absolutely necessary to access the SIM holder.
For software configuration once the modem is recognised, see the
[Cellular Modem User's Guide][16].
## Getting Started
@@ -358,3 +397,6 @@ make aarch64
[12]: https://github.com/frank-w/u-boot/releases
[13]: https://github.com/frank-w/u-boot/releases/download/CI-BUILD-2026-01-bpi-2026.01-2026-01-15_2013/bpi-r4_spim-nand_bl2.img
[14]: https://github.com/frank-w/u-boot/releases/download/CI-BUILD-2026-01-bpi-2026.01-2026-01-15_2013/bpi-r4_spim-nand_fip.bin
[15]: https://docs.banana-pi.org/bpi-r4/bpi-r4_4g5g_2.jpg
[16]: https://www.kernelkit.org/infix/latest/modem/