Hi,
I am facing an issue where after doing "eret" to EL1 when I see from DS-5 debugger MMU view I can see VTTBR_EL2 entries.
It seems that at EL1 level VTTBR_EL2 is visible as debugger is able to parse that memory ? I am confused as my Linux…
I want to build linux kernel with minimal features from sources and simple file system to run on Juno.
Please let me know from where I can download linux kernel sources and simple root file system ?
I tried building Linaro kernel base for Juno and facing…
Hi experts，
请问如何理解ARMv8内存属性device中，引入的Re-Ordering概念，感觉实际意义不大。
或者可以举个例子来说明这个概念的必要性。
谢谢！
Hi, experts,
Re-Orderingis a new attribute in ARMv8.
Can you explain Device-nGRE, and How to distinguish Device-nGRE and Device-nGnRE?
Thanks.
Hi
I am trying to boot Juno linux kernel and using my boot sequence.
I am facing issue with Juno linux code where it is mapping some fixed map which i guess is due to UEFI requirement.
Is there any way I can disable it in Juno linux kernel ? or is there…
Hi all,
Is anyone had run kexec on Juno board successfully? I tried, but can't jump to the second kernel. From DS-5, I found the pc register point to addr 0x00000xxxxx,
which means failed in kexec-tools. The tools I get from "git://git.kernel.org…
大家好：
刚接触ARM，有个问题想请教大家。
问题是这样的：
我想在TrustZone的secure world中做一些东西，需要non-secure world和secure world进行通信。
因为没有开发板，所以就利用ARM提供的ARM v8 基础模型（Foundation Model）。并且利用了
Open Virtualization提供的SDK SierraTEE。但是根据
http://www.openvirtualization.org/SierraTEE_build_and_boot_guide…
I'm evaluating the ARM DS-5 and Linaro toolchains and the FVP model simulators. I'm starting with the DS-5 Community Edition and the Foundation Profile simulator before advancing to the commercial tools. So I have a few questions:
I am writing a simple spinlock taking Juno arm trusted firmware spinlock code.
But for me stxr instruction is always failing giving w1 value as "1" always.
When I read ARMv8 spec it says (under section B2.10.5) "Unpredictable behavior when…
Hi All,
My Juno board could run a big-endian kernel, but it just work in UP mode, when I compiled
the kernel in SMP mode, it always halted in "arch_spin_lock".
I checked the PE status, when halted, pc register alway…
Hi ARM experts,
I'm new to develop boorom with armv8 CPU.
I have seen the example in ARM DS-5 .(startup_v8_ARMCompiler6)
But I have no idea which step is essential .
Could you show me or tell me where I can find the related…
Hi, ARM experts:
I found there are some crypto instructions in v8 Arch, they use register Vn.
Does these operations own a secure property, i.e. how to ensure non-secure world can not visit or dump some secure information?
Steven…
1、Arm compiler 6 下target分为两种：aarch64-arm-none-eabi（对应AArch64执行状态）和armv8a-arm-none-eabi（对应AArch32执行状态），当target设置为aarch64-arm-none-eabi时无法使用内嵌汇编指令QADD、QADD16等，当target设置为armv8a-arm-none-eabi时可以使用内嵌汇编指令QADD、QADD16等，这应该是和两种执行状态各种的指令集相关，但是前面提前的可以编译时在Debug下…
If a char parameter is passed to a routine in Aarch64 is the top of the word undefined? and is the same true for if a char value is returned? I think the answer is yes but it would be good to be certain. This means if the char is used in some arithmetic…
I am trying to create configdb entry for debug to conect to coresight using D-STREAM. I put ARMCS-DP in scan chain and try to configure .
Debug hardware config tool complains Coresight ROM table has failed - failed to read confi item DAP_CONFIG_INFO…
hi experts,
ARMv7 spin-lock use 'WFE' instruction to wait for lock release and use 'SEV' in spin-unlock to notify all cores.
but ARMv8 use 'SEVL; WFE' instructions in spin…
I have compiled a simple "Hello World" program on DS-5 ultimate evaluation version and couldn't find a bare metal FVP on which I can run it. When I select "ARM FVP->VE_AEMv8x1->Bare Metal Debug->Debug ARMAEMv8-A" in "Connection" tab of "Debug Configuration…
I am studying the ARMv8 exception levels. I have a question about ELs.
EL1 is described to run OS kernel and EL0 is application level.
The exception levels change only occur on exception or exception return.
In ARMv7, the instruction…
哪个亲知道ARM-V8的AA64与ARM-V7 LPAE的MMU Table差距多少？
ARM DS-5自带的example看起来挺麻烦的，关键是没有run起来，光看代码没有效果！
Dear Ronan,
We recently got a Juno board. We sucessfully done the setup for android on that.(using the steps given in Setting up Android on Juno)
We are working on some multimedia application, which we want to port it to juno and see the performnace…
Dear friends......
How do I share data with juno development platfrom board and host system?
Weather the communication should be via NFS or adb.
We tried two things,
1. We connected the juno board via USB configuration port. Then when we did…
I find an event "Real-Time & Embedded Computing Conference (RTECC)" from ARM official website. ARM will introduce The ARM Processor Roadmap Deciphered including Cortex-A56 (64-bit) in this event. Considering next generation ARMv8 64-bit…
Hi experts,
I have tried to configure the attribute of one memory region not able to be write in secure world and then try to write data into this region.
What I expect is that there will be an exception raising after write data into this region. But what…
Hello everyone,
I hope to find some assembly language examples of ARMv8 AArch64 instruction set.
Where can I find them?
Thank you in advance !
I am interested in buying a Juno development board, but have a set of technical questions related to the platform, namely:
(1) What are the migration modes that are available on the ARMv8 big.LITTLE? In particular, can I use both Cluster and Global…