Re: [seL4] camkes-arm-vm not registering GPIO?

Hi Kent, Thank you for the direction. I set CONFIG_TK1_INSECURE in the kernel config and rebuilt the TK1 image however I was unable to successfully tftpboot. Rather than pull in all insecure TK1 devices I specifically added only the GPIO MMIO and Interrupts in projects/vm/components/VM/vm_common.camkes: . . . #ifdef CONFIG_PLAT_TK1 vm.untyped_mmios = [ "0x50046000:12", // Interrupt Controller Virtual CPU interface (Virtual Machine view) "0x60004000:12", // Interrupt controller registers (ICTLR) "0x6000d000:12", // GPIOS 1-8 "0x700b0000:12", // SDMMC-1, SDMMC-2, SDMMC-3, SDMMC-4, . . . vm.irqs = [27, // INTERRUPT_VGPT (INTERRUPT_PPI_11) 53, // INTERRUPT_USB2 63, // INTERRUPT_SDMMC4 64, // INTERRUPT_GPIO1 65, // INTERRUPT_GPIO2 66, // INTERRUPT_GPIO3 67, // INTERRUPT_GPIO4 87, // INTERRUPT_GPIO5 119, // INTERRUPT_GPIO6 121, // INTERRUPT_GPIO7 122, // INTERRUPT_UARTD 129, // INTERRUPT_USB3 157, // INTERRUPT_GPIO8 . . . Doing this allows me to tftpboot but still see GPIO devices failing to register (and no GPIO devices in /sys). Right now my questions are: (1) Are you able to successfully enable CONFIG_TK1_INSECURE and boot on the TK1? (2) Are there more devices/interrupts other than GPIO specific ones that need to be pulled into the config for GPIO to function? Steven On 05/10/17 00:26, Kent.Mcleod@data61.csiro.au wrote:

Hi Steven,

Your problem could be that the GPIO MMIO frame is not being given to the VM. The config setting CONFIG_TK1_INSECURE increases the amount of hardware devices that are passed through to the VM. Once the GPIO device is accessible in the VM, Linux should be able to attach its own GPIO driver which will then make it accessible through sysfs.

Currently on TK1 there isn't support for virtualisation of the GPIO hardware so you can either give Linux access to the hardware frames to manage GPIO hardware itself, or use a limited seL4 gpio driver in a separate CAmkES component but this wouldn't be accessible from on top of Linux unless you created your own virtual device. Hope this helps.

Kind regards, Kent ________________________________________ From: Devel on behalf of Steven Johnston Sent: Tuesday, May 9, 2017 9:45 AM To: devel@sel4.systems Subject: [seL4] camkes-arm-vm not registering GPIO?

Hi All,

I am playing around with the capabilities of the camkes-arm-vm project pn the Tegra TK1 and and wondering if someone else has come across this issue. It looks like GPIO functionality is not available in the buildroot.

I can confirm the GPIO source is present and is being built:

camkes-arm-vm/libs/libplatsupport/rc/plat/tk1/gpio.c camkes-arm-vm/libs/libplatsupport/plat_include/tk1/platsupport/plat/gpio.h

[CC] src/plat/tk1/gpio.o

The expected sysfs support is not present and looking and the relevant dmesg:

# dmesg | grep gpio

[ 0.057543] gpiochip_add: GPIOs 0..255 (tegra-gpio) failed to register [ 1.485061] input: gpio-keys as /devices/soc0/gpio-keys/input/input0

Any thoughts on what could be causing GPIO to the failing to register?

Steven

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