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Flag enable_rp1_uart as being Pi5-only #4240

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Merged
merged 1 commit into from
Nov 6, 2025
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Flag enable_rp1_uart as being Pi5-only #4240

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2 changes: 2 additions & 0 deletions documentation/asciidoc/computers/config_txt/boot.adoc
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Expand Up @@ -165,6 +165,8 @@ Default: `0x0`
[[enable_rp1_uart]]
==== `enable_rp1_uart`

Raspberry Pi 5 only.

When set to `1`, firmware initialises RP1 UART0 to 115200bps and doesn't reset RP1 before starting the OS (separately configurable using `pciex4_reset=1`).
This makes it easier to get UART output on the 40-pin header in early boot-code, for instance during bare-metal debug.

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