Hi Tiger, The ARM recommendation to manage secondary CPUs (the primary CPU is the CPU that runs UEFI and starts your OS kernel) is to use PSCI (Power State Coordination Interface - http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0022b/index.h tml). PSCI uses SMCs (Secure Memory Calls) to bring up secondary CPUs (CPU_UP / CPU_DOWN). This code runs in Secure World while UEFI runs in Non-Secure World.
For the story... I started to implement PSCI support in Tianocore source code (in ArmPlatformPkg/Sec). But the EDK2 framework (PCD/Library/INF/FDF etc) had made the code quite hard to maintain. So, I wrote a new secure firmware framework project to handle this support. This firmware is not Open Source (available in binary format for TC2 only). A new project has been started by ARM Ltd last month. It is an Open Source implementation of the Trusted/Secure Firmware: https://github.com/ARM-software/arm-trusted-firmware Unfortunately at this stage, 32bit is not supported (only AArch64 is supported). And as far as I know there is no plan to add 32bit support by ARM Ltd in the short term. The current ArmPlatformPkg/Sec has support to hold the secondary cores in WFI. But it does not support PSCI. The current support might be sufficient enough for you at this stage. Thanks, Olivier > -----Original Message----- > From: tiger...@viatech.com.cn [mailto:tiger...@viatech.com.cn] > Sent: 04 December 2013 01:51 > To: edk2-devel@lists.sourceforge.net > Cc: Olivier Martin > Subject: [edk2] SEC code support big.LITTLE tech? > > Hi, Oliver: > Does current ArmPlatformPackage's sec code support big.LITTLE tech? > Such as : > An ARM SOC --- with 4 Cores Cortex-A15, 4 Cores Cortex-A7 > > So, if sec code support big.LITTLE tech, how does it let one core as > boot strap cpu, others go into wfe(or other sleeping state)? > > Best wishes, ------------------------------------------------------------------------------ Sponsored by Intel(R) XDK Develop, test and display web and hybrid apps with a single code base. Download it for free now! http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
