radxa-RockPi4(C): Add SPI documentation

Co-authored-by: Samuel Dionne-Riel <[email protected]>
Prathyushz · Mar 6, 2022 · 2c5ed58 · 2c5ed58
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diff --git a/boards/radxa-RockPi4/README.md b/boards/radxa-RockPi4/README.md
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+# Radxa ROCK Pi 4 model A/B
+
+## Device-specific notes
+
+According to the [upstream SPI documentation](https://wiki.radxa.com/Rockpi4/hardware/spi_flash),
+the SPI flash is only populated on board revisions V1.4 and later.
+
+While the schematics denote `W25Q64FV` is used, all verified units came
+with an `XT25F32B`.
+
+If no flash is present, the user either needs to use the shared storage strategy,
+or needs to manually solder on some pin-compatible SPI flash (`SOP8` footprint).
diff --git a/boards/radxa-RockPi4C/README.md b/boards/radxa-RockPi4C/README.md
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+# Radxa ROCK Pi 4 model C
+
+## Device-specific notes
+
+This board is nearly identical to the [Radxa ROCK Pi 4 A/B](./devices/radxa-RockPi4.html).
+As a result, all device-specific notes from there also apply here.