Last updated May 9th, 2018.
This is an implementation of ATF for the RPi3 platform, based off of https://github.com/ardbiesheuvel/arm-trusted-firmware/tree/rpi3.
No attempt has been made to keep it in sync with https://github.com/ARM-software/arm-trusted-firmware. Sorry.
This tree is meant to be used with a preloaded BL33 payload, as part of a UEFI or U-Boot implementation for the Raspberry Pi 3.
This is a 64-bit implementation.
export CROSS_COMPILE=aarch64-linux-gnu-
make -C raspberry-pi3-atf PLAT=rpi3 PRELOADED_BL33_BASE=0x30000 SUPPORT_VFP=1 DEBUG=1 V=1 fip all
This is not directly useful by itself, since you would need to combine the BL1 and FIP with a BL33 payload.
- PSCI_CPU_ON_AARCH64
- PSCI_SYSTEM_RESET
- PSCI_SYSTEM_OFF (as PSCI_SYSTEM_RESET)
- Compatible with Windows on Arm ;-).
ATF of course runs in secure mode, but there is no secure memory, and there are no secure peripherals. Caveat Emptor!
This ATF implementation expects the following memory layout:
| Address Start | Address End | What |
|---|---|---|
0x00000000 |
0x00007FFF |
BL1 |
0x00008000 |
0x0000FFFF |
DTB |
0x00010000 |
0x0002FFFF |
FIP containing BL2 + BL31 |
0x00030000 |
0x001FFFFF |
BL33 Non-Secure firmware |
0x00200000 |
0x0024FFFF |
"Secure SRAM" |
0x00250000 |
0x003FFFFF |
"Secure DRAM" |
0x00400000 |
... | Non-Secure DRAM |
This means that a minimally-viable image will concatenate BL1, FIP and the BL33
payload, to be loaded via a custom config.txt:
arm_control=0x200
enable_uart=1
armstub=atf_and_bl33.bin
disable_commandline_tags=2
device_tree_address=0x8000
device_tree_end=0x10000
[0x8000:0x10000) is where you can load the DTB if you want it, this ATF implementation does not use
the DTB in any way.
Andrey Warkentin andrey.warkentin@gmail.com
Btw, feel free to upstream, if so inclined.