June 2022 - Devel - lists.sel4.systems

sel4 on bare-metal | Questions and comments
by Sid Agrawal 10 Jun '22

10 Jun '22

Hi, As per instructions from here[1, 2], I tried booting seL4 on an x86_64-desktop, x86_64-server as RPi4. I was able to get it to work on RPi4 with one minor change to the instructions, but I could not boot it on the x86_64-desktop or the x86_64-server. Below is my experience and the issues I faced. RPi4 ------ Spec: 8GB standard Rpi4 The final command "fatload mmc 0 0x10000000 sel4test-driver-image-arm-bcm2711" gave the following error: ** Reading file would overwrite reserved memory ** Failed to load 'sel4test-driver-image-arm-bcm2711 I could get around it by using a load address that was smaller by a factor of 0x10.( 0x1000000 instead of 0x10000000 i.e. one less zero). I cannot claim I understand why the first address failed and the second worked. Any pointers on that would help. After the change in the address, I saw the sel4 tests run as expected. x86_64 server ------------------ Spec: Dell R520, two quad-core Xeons (E5-2407 v2 @ 2.40GHz), 32GB of memory. The server's serial is redirected to the IPMI console. On the IPMI console, I see many messages related to the bios, etc. And finally, I see this: MBR SYSLINUX 6.04 EDD [...] Loading sel4kernel... ok Loading rootserver... ok But nothing after this. Any thoughts of what could be going wrong here? I did not see any sel4 prints. x86_64 Desktop ---------------------- Spec: Core 2 Quad, 4 GB ram It was able to find the pinout for the serial port on the motherboard and connected to it(just like for RP). There was no output on the serial console. Even when bios-related messages were printed on the monitor, there was no output on the serial pins. I might need to enable the serial output on those pins in the bios or something similar. Fortunately, even though the serial pins did not have any output, the monitor output was the same as for the server. Unfortunately, it did not get any farther along than the server. MBR SYSLINUX 6.04 EDD [...] Loading sel4kernel... ok Loading rootserver... ok Any pointers here would be helpful. Thanks, Sid UBC Graduate Student ARM Research Intern [1] https://docs.sel4.systems/Hardware/IA32 [2] https://docs.sel4.systems/Hardware/Rpi4.html

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Implementation of SeL4
by Sriram 09 Jun '22

09 Jun '22

Greetings This is Sriram Prakash, currently working on a project on secure system applications for avioics and found the concept and key use case of seL4 microkernel aligned to our main application : creating a secure OS on bareboard application We are facing certain issues as follows: - Booting via flashdrive, Output on Screen shows "Loading sel4 OK","Loading rootserver OK" and no other output in display, we recieved junk values using serial port Output. - We have put up a query on sel4Discourse : https://sel4.discourse.group/t/sel4-vm-linux-boot-in-x86-64-platform-pc/527, about the issues we are facing. - How to receive output in Display - Booting Linux VM on top of seL4 Any insights regarding the issues would be grateful, thank you for your time Regards R.Sriram Prakash

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Running RISC-V seL4 in QEMU 7.0.50
by porter.188＠osu.edu 03 Jun '22

03 Jun '22

Hello, I'm trying to run sel4test in QEMU 7.0.50. I can compile successfully but sel4test hangs at "Jumping to kernel-image entry point...". Is there something different required now that sel4 is using OpenSBI? $ qemu-system-riscv64 -nographic -serial mon:stdio -m size=4095M -bios none -kernel images/sel4test-driver-image-riscv-spike OpenSBI v0.8 ____ _____ ____ _____ / __ \ / ____| _ \_ _| | | | |_ __ ___ _ __ | (___ | |_) || | | | | | '_ \ / _ \ '_ \ \___ \| _ < | | | |__| | |_) | __/ | | |____) | |_) || |_ \____/| .__/ \___|_| |_|_____/|____/_____| | | |_| Platform Name : ucbbar,spike-bare,qemu Platform Features : timer,mfdeleg Platform HART Count : 1 Boot HART ID : 0 Boot HART ISA : rv64imafdcsuh BOOT HART Features : pmp,scounteren,mcounteren BOOT HART PMP Count : 16 Firmware Base : 0x80000000 Firmware Size : 96 KB Runtime SBI Version : 0.2 MIDELEG : 0x0000000000001666 MEDELEG : 0x0000000000f0b509 PMP0 : 0x0000000080000000-0x000000008001ffff (A) PMP1 : 0x0000000000000000-0xffffffffffffffff (A,R,W,X) ELF-loader started on (HART 0) (NODES 1) paddr=[80200000..8066a037] Looking for DTB in CPIO archive...found at 802d2128. Loaded DTB from 802d2128. paddr=[84020000..84020fff] ELF-loading image 'kernel' to 84000000 paddr=[84000000..8401ffff] vaddr=[ffffffff84000000..ffffffff8401ffff] virt_entry=ffffffff84000000 ELF-loading image 'sel4test-driver' to 84021000 paddr=[84021000..843f6fff] vaddr=[10000..3e5fff] virt_entry=1b982 Enabling MMU and paging Jumping to kernel-image entry point...

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UNSW tenure-track position
by Gernot Heiser 01 Jun '22

01 Jun '22

Any recent or soon PhD graduates whose work is around seL4? If os you might be interested in the operating system faculty position we have open at UNSW: https://external-careers.jobs.unsw.edu.au/cw/en/job/502766/lecturersenior-l… Gernot

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