sunxi: binman: Add support for including SCP firmware
Allwinner sun50i SoCs contain an OpenRISC 1000 CPU that functions as a System Control Processor, or SCP. ARM Trusted Firmware (ATF) communicates with the SCP over SCPI to implement the PSCI system suspend, shutdown and reset functionality. Currently, SCP firmware is optional; the system will boot and run without it, but system suspend will be unavailable. Since all communication with the SCP is mediated by ATF, the only thing U-Boot needs to do is load the firmware into SRAM. The SCP firmware occupies the last 16KiB of SRAM A2, immediately following ATF. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Samuel Holland <samuel@sholland.org> Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Samuel Holland
Jagan Teki
parent
18bd45592c
commit
e72a6be4fc
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@ -2,8 +2,10 @@
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#ifdef CONFIG_MACH_SUN50I_H6
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#define BL31_ADDR 0x104000
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#define SCP_ADDR 0x114000
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#else
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#define BL31_ADDR 0x44000
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#define SCP_ADDR 0x50000
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#endif
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/ {
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@ -59,6 +61,19 @@
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};
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};
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scp {
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description = "SCP firmware";
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type = "firmware";
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arch = "or1k";
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compression = "none";
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load = <SCP_ADDR>;
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scp {
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filename = "scp.bin";
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missing-msg = "scp-sunxi";
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};
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};
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@fdt-SEQ {
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description = "NAME";
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type = "flat_dt";
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@ -72,7 +87,7 @@
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@config-SEQ {
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description = "NAME";
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firmware = "atf";
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loadables = "uboot";
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loadables = "scp", "uboot";
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fdt = "fdt-SEQ";
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};
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};
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@ -14,8 +14,12 @@ Quick Start / Overview
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- Build the ARM Trusted Firmware binary (see "ARM Trusted Firmware (ATF)" below)
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$ cd /src/arm-trusted-firmware
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$ make PLAT=sun50i_a64 DEBUG=1 bl31
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- Build the SCP firmware binary (see "SCP firmware (Crust)" below)
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$ cd /src/crust
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$ make pine64_plus_defconfig && make -j5 scp
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- Build U-Boot (see "SPL/U-Boot" below)
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$ export BL31=/path/to/bl31.bin
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$ export SCP=/src/crust/build/scp/scp.bin
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$ make pine64_plus_defconfig && make -j5
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- Transfer to an uSD card (see "microSD card" below)
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$ dd if=u-boot-sunxi-with-spl.bin of=/dev/sdx bs=8k seek=1
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@ -24,13 +28,17 @@ Quick Start / Overview
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Building the firmware
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=====================
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The Allwinner A64/H5 firmware consists of three parts: U-Boot's SPL, an
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ARM Trusted Firmware (ATF) build and the U-Boot proper.
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The SPL will load both ATF and U-Boot proper along with the right device
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tree blob (.dtb) and will pass execution to ATF (in EL3), which in turn will
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drop into the U-Boot proper (in EL2).
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As the ATF binary will become part of the U-Boot image file, you will need
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to build it first.
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The Allwinner A64/H5/H6 firmware consists of several parts: U-Boot's SPL,
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ARM Trusted Firmware (ATF), optional System Control Processor (SCP) firmware
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(e.g. Crust), and the U-Boot proper.
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The SPL will load all of the other firmware binaries into RAM, along with the
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right device tree blob (.dtb), and will pass execution to ATF (in EL3). If SCP
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firmware was loaded, ATF will power on the SCP and wait for it to boot.
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ATF will then drop into U-Boot proper (in EL2).
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As the ATF binary and SCP firmware will become part of the U-Boot image file,
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you will need to build them first.
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ARM Trusted Firmware (ATF)
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----------------------------
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@ -53,6 +61,31 @@ As sometimes the ATF build process is a bit picky about the toolchain used,
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or if you can't be bothered with building ATF, there are known working
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binaries in the firmware repository[3], purely for convenience reasons.
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SCP firmware (Crust)
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----------------------
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SCP firmware is responsible for implementing system suspend/resume, and (on
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boards without a PMIC) soft poweroff/on. ATF contains fallback code for CPU
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power control, so SCP firmware is optional if you don't need either of these
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features. It runs on the AR100, with is an or1k CPU, not ARM, so it needs a
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different cross toolchain.
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There is one SCP firmware implementation currently available, Crust:
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$ git clone https://github.com/crust-firmware/crust
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$ cd crust
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$ export CROSS_COMPILE=or1k-linux-musl-
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$ make pine64_plus_defconfig
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$ make scp
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The same configuration generally works on any board with the same SoC (A64, H5,
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or H6), so if there is no config for your board, use one for a similar board.
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Like for ATF, U-Boot finds the SCP firmware binary via an environment variable:
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$ export SCP=/src/crust/build/scp/scp.bin
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If you do not want to use SCP firmware, you can silence the warning from binman
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by pointing it to an empty file:
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$ export SCP=/dev/null
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SPL/U-Boot
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------------
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Both U-Boot proper and the SPL are using the 64-bit mode. As the boot ROM
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@ -13,3 +13,7 @@ Firmware and build with BL31=/path/to/bl31.bin
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atf-bl31-sunxi:
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Please read the section on ARM Trusted Firmware (ATF) in
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board/sunxi/README.sunxi64
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scp-sunxi:
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SCP firmware is required for system suspend, but is otherwise optional.
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Please read the section on SCP firmware in board/sunxi/README.sunxi64
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