| #
17b0bb6c |
| 27-Sep-2019 |
Soby Mathew <soby.mathew@arm.com> |
Merge changes from topic "raspberry-pi-4-support" into integration
* changes:
rpi4: Add initial documentation file
rpi4: Add stdout-path to device tree
rpi4: Add GIC maintenance interrupt to G
Merge changes from topic "raspberry-pi-4-support" into integration
* changes:
rpi4: Add initial documentation file
rpi4: Add stdout-path to device tree
rpi4: Add GIC maintenance interrupt to GIC DT node
rpi4: Cleanup memory regions, move pens to first page
rpi4: Reserve resident BL31 region from non-secure world
rpi4: Amend DTB to advertise PSCI
rpi4: Determine BL33 entry point at runtime
rpi4: Accommodate "armstub8.bin" header at the beginning of BL31 image
Add basic support for Raspberry Pi 4
rpi3: Allow runtime determination of UART base clock rate
FDT helper functions: Respect architecture in PSCI function IDs
FDT helper functions: Add function documentation
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| #
c4597e13 |
| 10-Jul-2019 |
Andre Przywara <andre.przywara@arm.com> |
rpi4: Accommodate "armstub8.bin" header at the beginning of BL31 image
The Raspberry Pi GPU firmware checks for a magic value at offset 240
(0xf0) of the armstub8.bin image it loads. If that value m
rpi4: Accommodate "armstub8.bin" header at the beginning of BL31 image
The Raspberry Pi GPU firmware checks for a magic value at offset 240
(0xf0) of the armstub8.bin image it loads. If that value matches,
it writes the kernel load address and the DTB address into subsequent
memory locations.
We can use these addresses to avoid hardcoding these values into the BL31
image, to make it more flexible and a drop-in replacement for the
official armstub8.bin.
Reserving just 16 bytes at offset 240 of the final image file is not easily
possible, though, as this location is in the middle of the generic BL31
entry point code.
However we can prepend an extra section before the actual BL31 image, to
contain the magic and addresses. This needs to be 4KB, because the
actual BL31 entry point needs to be page aligned.
Use the platform linker script hook that the generic code provides, to
add an almost empty 4KB code block before the entry point code. The very
first word contains a branch instruction to jump over this page, into
the actual entry code.
This also gives us plenty of room for the SMP pens later.
Change-Id: I38caa5e7195fa39cbef8600933a03d86f09263d6
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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