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rpi4: Fix documentation of armstub config entry 

It's in fact mandatory. Seen with RPi firmware 1.20190925.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Change-Id: I80739b74f25817294adc52cfd26a3ec59c06f892
This commit is contained in:
Jan Kiszka 2019-12-09 12:48:42 +01:00 committed by Olivier Deprez
parent 2aa60e703c
commit 433090515d
1 changed files with 4 additions and 5 deletions
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9
docs/plat/rpi4.rst
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@ -24,11 +24,10 @@ one universal binary (bl31.bin), which can be built with:
CROSS_COMPILE=aarch64-linux-gnu- make PLAT=rpi4 DEBUG=1
Copy the generated build/rpi4/debug/bl31.bin to the SD card, either
renaming it to ``armstub8.bin`` or adding an entry starting with ``armstub=``,
then followed by the respective file name to ``config.txt``.
You should have AArch64 code in the file loaded as the "kernel", as BL31
will drop into AArch64/EL2 to the respective load address.
Copy the generated build/rpi4/debug/bl31.bin to the SD card, adding an entry
starting with ``armstub=``, then followed by the respective file name to
``config.txt``. You should have AArch64 code in the file loaded as the
"kernel", as BL31 will drop into AArch64/EL2 to the respective load address.
arm64 Linux kernels are known to work this way.
Other options that should be set in ``config.txt`` to properly boot 64-bit