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board/raspberrypi/readme.txt: add videocore note

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The VideoCore blobs for the Raspberry Pi 1, 2, 3, Zero, Zero W and Zero
2 W are differents from the ones for the Raspberry Pi 4 and the Compute
Module 4.

The VideoCore blobs for the Raspberry Pi 4 are named with a 4[1] (i.e.
start4.elf, start4x.elf, start4db.elf and start4cd.elf).

This precises which VideoCore firmware blob files are present on the
Raspberry Pi 1, 2, 3, Zero W, Zero 2 W and which files are present on
the the Rapsberry Pi 4 and the Compute Module 4.

Note: The VideoCore blobs for the Raspberry Pi 5 are self-contained in
its bootloader EEPROM[1][2]; there is no additional files for pi5.

[1]: https://www.raspberrypi.com/documentation/computers/configuration.html#start-elf
[2]: https://www.raspberrypi.com/documentation/computers/config_txt.html#start_file-fixup_file

Signed-off-by: Gaël PORTAY <gael.portay+rtone@gmail.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
This commit is contained in:
Gaël PORTAY
2025-04-15 17:31:24 +02:00
committed by Julien Olivain
parent a642bed09a
commit 7ebcfe3cb9
1 changed files with 10 additions and 6 deletions
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16
board/raspberrypi/readme.txt
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@@ -115,11 +115,11 @@ After building, you should obtain this tree:
| +-- bootcode.bin [2]
| +-- cmdline.txt
| +-- config.txt
| +-- fixup.dat [1]
| +-- fixup4.dat [1]
| +-- start.elf [1]
| +-- start4.elf [1]
| `-- overlays/ [3]
| +-- fixup.dat [3]
| +-- fixup4.dat [4]
| +-- start.elf [3]
| +-- start4.elf [4]
| `-- overlays/ [5]
+-- sdcard.img
+-- Image [1]
`-- zImage [1]
@@ -131,7 +131,11 @@ After building, you should obtain this tree:
Pi 4, 400, 5 and the Compute Module 4, 4s and 5 load the second stage
bootloader from a SPI flash EEPROM.
[3] Only for the Raspberry Pi installing device-tree overlays. The Raspberry Pi
[3] Only for the Raspberry Pi 1, 2, 3, Zero and Zero 2.
[4] Only for the Raspberry Pi 4, 400, Compute Module 4 and 4s.
[5] Only for the Raspberry Pi installing device-tree overlays. The Raspberry Pi
with Bluetooth connectivity (Zero W, Zero 2 W, 3, 4, 400, Compute Module 4
and 4s) use the miniuart-bt overlay to enable UART0 for the serial console;
the Bluetooth uses the mini-UART instead. Alternative would be to disable