Hi Tiger, AFAIK, the AArch64 ISA is written from scratch for 64-bit support. Although it is backward compatible with AArch32 and binaries compiled for AArch32 (ARMv7 compatible) are supposed to run well on the ARMv8 machine running in AArch32 mode.
However, as per my understanding (and Olivier can correct me if I am wrong here), the UEFI code for ARMv8 executes in AArch64 mode - usually if the ARM core boots up in AArch64 in EL3, bootloaders like UEFI/u-boot also execute in AArch64 EL3 or EL2. Regards, Bhupesh > -----Original Message----- > From: tiger...@viatech.com.cn [mailto:tiger...@viatech.com.cn] > Sent: Monday, January 13, 2014 6:32 AM > To: edk2-devel@lists.sourceforge.net > Cc: oliviermar...@users.sourceforge.net > Subject: [edk2] [edk2-ARM] ARMv8 bootloader question > > Hi, Oliver: > I have a question abourt ARMv8 CPU's bootloader. > ARMv8 supports: AARCH32 / AARCH64 > Take an example: > An ARMv8 SOC, when power up / reset, its default state is : AARCH32 Then, > could i still run an old arm uefi bootloader which written by > ARMv7 instruction set? > I will switch ARMv8 SOC to AARCH64 before jumping into linux kernel. > Is it possible? > > Best wishes, > > ------------------------------------------------------------------------- > ----- > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical > Workloads, Development Environments & Everything In Between. > Get a Quote or Start a Free Trial Today. > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clk > trk > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/edk2-devel > ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
