Hi Tiger, You can use the AArch64 foundation model support code in the EDK2 code base to write reference code for your ARMv8 SoC.
Also which toolchain do you use for compiling your AArch32 (32-bit code)? Regards, Bhupesh > -----Original Message----- > From: tiger...@viatech.com.cn [mailto:tiger...@viatech.com.cn] > Sent: Monday, January 13, 2014 9:16 AM > To: edk2-devel@lists.sourceforge.net > Subject: Re: [edk2] [edk2-ARM] ARMv8 bootloader question > > Hi, sharma: > Thanks for your answer! > I described my understanding on current ARM UEFI code: > 1. Most ARM UEFI code package is based on ARMv7 SOCs. > Because of lacking ARMv8 development board, so enthusiast ported uefi > code on 32bit SOC. > 2. ARMv8 supports aarch32 state. > So, if ARMv8 SOC powered to aarch32 state: > Developer could use current 32bit uefi code as code base to boot to > uefi shell environment. > 3. at uefi shell environment, there are 2 methods to boot 64bit linux > kernel. > (1) switch to aarch64 state, then boot to linux kernel's entry point. > (2) linux kernel's entry point included code to switch itself's > execute state to aarch64.if this assumption exist, uefi bootloader just > keep aarch32 state. > > Best wishes, > -----邮件原件----- > 发件人: bhupesh.sha...@freescale.com > [mailto:bhupesh.sha...@freescale.com] > 发送时间: 2014年1月13日 11:26 > 收件人: 'edk2-devel@lists.sourceforge.net' > 抄送: 'oliviermar...@users.sourceforge.net' > 主题: Re: [edk2] [edk2-ARM] ARMv8 bootloader question > > 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.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.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
