How does Linux Kernel or BIOS map the PCIe endpoint device memory into systems MMIO space ? Is there any API to achieve it ? Lets assume that when wri ...
How does Linux Kernel or BIOS map the PCIe endpoint device memory into systems MMIO space ? Is there any API to achieve it ? Lets assume that when wri ...
I am trying to use the ARM watchdog thorough kernel space. I have a watchdog driver which is statically built and deployed in the kernel. The memory r ...
I'm new to kernel programming, and now trying to write some values to a 32-bit GPIO register in a device driver. The I/O is ioremap()-ed to a memory a ...
I need to reserve a large buffer of physically contiguous RAM from the kernel and be able to gaurantee that the buffer will always use a specific, har ...
I would like to know the expected result of reading block data from MTD flash, as per the code below: #define PHY_ADDR 0x80000000 // certain physic ...
firstly i have to admit that i'm a newbie. so don't go hard on me plz. i want to reserve memory at boot time and then use this memory in a kernel modu ...
Is it bad to call ioremap() on system DRAM. I would like to reserve a space in system DRAM that will not be used by any other process. Would this be t ...
Can you mmap (user) and ioremap_nocache (kernal) the same phys address say that of an fpga? ...
I am attempting to access a given memory-region on an am335x-processor in Linux. The idea is to first designate physical addresses, then access said a ...
My NEC microcontroller has a timer controller register 8-bits - Do, I need to pass 8 in the second parameter of ioremap? After reading the spec, I go ...
I have come across a term - holes in the memory in Linux. I believe this is the memory that is I/O remapped. Is my understanding correct? ...
I am trying to write an ioremap kernel module - X86 PC. This module will read the value from the serial port. How to find the SERIAL_ADDR, SERIAL_SIZE ...
I am using "ioremap" to map the address of a GPIO port in the datasheet of Ti AM3359 . The code is running fine. Problem: 1> The problem is , why ...
So, I am a total newbie when it comes to kernel drivers and have a question regarding ioremap function. I am writing a driver for accessing some regi ...
I am ARM Cortex A9 CPU with 2 cores. But I just use 1 core and the other is just in a busy loop. I setup the MMU table using section (1MB per entry) l ...
I am developing a simple driver for linux that will talk to a device over SPI. After i use request_mem_region and ioremap all i can read from the retu ...
I am using ubuntu 12.10 32 bit on an x86 system. I have physical memory(about 32MB,sometimes more) which is enumerated and reserved through the ACPI t ...
http://www.mjmwired.net/kernel/Documentation/IO-mapping.txt Can one explain why this holds We can directly access only the 640k-1MB area? ...