embedded-linux

问题 This question already exists : Installation of j1939 for linux kernel [closed] Closed 11 days ago . Iam working with imx6ull board. Iam developing software stack for CAN J1939 protocol.In the development stage i got to know that we need to add support for J1939 in Kernel. Iam using Linux kernel version 4.1.15.Can anyone suggest a way to install J1939 in Linux kernel? 来源： https://stackoverflow.com/questions/60224434/j1939-in-linux-kernel

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 days ago . When I run apt-get update I get: W: GPG error: http://security.debian.org stretch/updates InRelease: Unknown error executing apt-key W: GPG error: http://ftp.be.debian.org/debian stretch Release: Unknown error executing apt-key E: Failed to fetch / E: Failed to fetch / E: Failed to fetch / E: Failed to fetch / E:

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 days ago . When I run apt-get update I get: W: GPG error: http://security.debian.org stretch/updates InRelease: Unknown error executing apt-key W: GPG error: http://ftp.be.debian.org/debian stretch Release: Unknown error executing apt-key E: Failed to fetch / E: Failed to fetch / E: Failed to fetch / E: Failed to fetch / E:

问题 I have been working with the Linux interrupt on ARM: request_irq() can be used to register an interrupt. On a single interrupt line you can register multiple interrupts with SHA_SHIRQ , i.e normal IRQ. On a particular interrupt line does Linux allow to register multiple SA_INTERRUPT ? That is can we register multiple interrupt handlers for an ARM fast interrupts or FIQ s? 回答1: Like the IRQ , the FIQ has a single point of entry from the vector table. You must inspect the interrupt controller

问题 I have been working with the Linux interrupt on ARM: request_irq() can be used to register an interrupt. On a single interrupt line you can register multiple interrupts with SHA_SHIRQ , i.e normal IRQ. On a particular interrupt line does Linux allow to register multiple SA_INTERRUPT ? That is can we register multiple interrupt handlers for an ARM fast interrupts or FIQ s? 回答1: Like the IRQ , the FIQ has a single point of entry from the vector table. You must inspect the interrupt controller

问题 1) Is it possible to access a physical address which is not defined in /proc/iomem? 2) If the physical address range of a device does not appear in /proc/iomem, does it mean that the device has not been utilized/initialized yet? 回答1: 1) Is it possible to access a physical address which is not defined in /proc/iomem? Yes. Assuming an ARM processor which memory maps all directly-connected periperals, the driver could perform an ioremap() operation to map the physical memory to virtual memory

问题 I am working on a school project which is related to Image Processing using OpenCV Python and Raspberry Pi 3. The hardware of Raspberry Pi 3 cannot handle the video from camera consecutively, therefore I'm thinking about only capture a picture after every 5 seconds from the camera and use it to recognize what I need, then continue. I did some research on the internet and found a function called time.sleep(5), however this function only pause the camera 5 seconds and then continue. Can anyone

问题 I am working on a school project which is related to Image Processing using OpenCV Python and Raspberry Pi 3. The hardware of Raspberry Pi 3 cannot handle the video from camera consecutively, therefore I'm thinking about only capture a picture after every 5 seconds from the camera and use it to recognize what I need, then continue. I did some research on the internet and found a function called time.sleep(5), however this function only pause the camera 5 seconds and then continue. Can anyone

问题 I wish to allocate a vector and use it's data pointer to allocate a zero copy buffer on the GPU. There is this cl_arm_import_memory extension which can be used to do this. But I am not sure wether its supported for all mali midgard OpenCL drivers or not. I was going through this link and I am quite puzzled by the following lines : - If the extension string cl_arm_import_memory_host is exposed then importing from normal userspace allocations (such as those created via malloc) is supported.

问题 I wish to allocate a vector and use it's data pointer to allocate a zero copy buffer on the GPU. There is this cl_arm_import_memory extension which can be used to do this. But I am not sure wether its supported for all mali midgard OpenCL drivers or not. I was going through this link and I am quite puzzled by the following lines : - If the extension string cl_arm_import_memory_host is exposed then importing from normal userspace allocations (such as those created via malloc) is supported.