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easiest way to access to device credentials from a Driver implementation?


easiest way to access to device credentials from a Driver implementation?

By : DisplayName=
Date : November 21 2020, 11:01 PM
This might help you I am fabricating a class to simplify distributing files to devices from cumulocity , You could poke it out of the Platform object that you get passed:
code :
public void initialize(Platform platform) throws Exception {
  PlatformParameters parms = (PlatformParameters)platform;
  String user = parms.getUser();
  String password = parms.getPassword();
  // ...
}


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Implementing PCIe Linux device driver (want to access my card registers from kernel driver)

Implementing PCIe Linux device driver (want to access my card registers from kernel driver)


By : gabriel boafo
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Ian,
I wrote a PCI driver for a device (full source). The mapping of the register space should be the same though. Here is how I do it.
code :
dm7820_device->pci[region].virt_addr = ioremap_nocache(address, length);
if (dm7820_device->pci[region].virt_addr == NULL) {
    printk(KERN_ERR "%s: ERROR: BAR%u remapping FAILED\n",
        &((dm7820_device->device_name)[0]), region);
    dm7820_release_resources();
    return -ENOMEM;
}

if (request_mem_region(address, length, &((dm7820_device->device_name)[0])) == NULL) {
    printk(KERN_ERR "%s: ERROR: I/O memory range %#lx-%#lx allocation FAILED\n",
        &((dm7820_device->device_name)[0]), address, (address + length - 1));
    dm7820_release_resources();
    return -EBUSY;
}
One Windows Form needs an access to the components of another. What is the easiest implementation?

One Windows Form needs an access to the components of another. What is the easiest implementation?


By : user3449442
Date : March 29 2020, 07:55 AM
will be helpful for those in need C++/CLI has an access modifier that native C++ does not have. You are looking for internal:
Empowered by the strong support for modules in .NET. It is broader than friend but you have a pretty hard guarantee that whomever is messing with your private parts is never more than a few cubicles away from yours. Code that accesses internal members must be compiled into the same assembly. So your FormB class must be in the same project as your FormA class. The common case.
How does Linux link device file with device driver? Does open() syscall eventually call device driver code?

How does Linux link device file with device driver? Does open() syscall eventually call device driver code?


By : Sathya
Date : March 29 2020, 07:55 AM
Implementation of USB device driver on my own OS based in Linux

Implementation of USB device driver on my own OS based in Linux


By : user3451772
Date : March 29 2020, 07:55 AM
this one helps. Implementing USB is quite the task. First you must have a working PCI(e) enumerator or other form of finding the USB controller. You then must find out which of the four most common controller types it happens to be. Each controller type is completely different from the previous and must contain its own driver. You also need a standard USB interface that is independent of the controller type.
Taking on the USB is quite the task, but in my opinion a very interesting and enjoyable task. Enjoyable enough, that I even wrote a book about how to do it. It explains how to find the controller(s) via the PCI(e) bus, how to setup this bus, how to detect the type of USB controller--UHCI, OHCI, EHCI, or xHCI--and how to send and receive data packets to/from attached devices. This book was written exactly for the purpose of those of us creating our own operating systems and adding USB support to them. The fact that you are basing your OS on Linux should not matter since the book does not rely upon any existing OS to accomplish this task, other than the example programs relying on memory allocation, which is easily modified for your developing platform.
Easiest driver for a Linux Device Driver newbie

Easiest driver for a Linux Device Driver newbie


By : Dean Hughes
Date : March 29 2020, 07:55 AM
may help you . You should start by studying the basics of Loadable Kernel Modules. First few chapters of LKMPG by Salzman will be a good start
And the easiest driver, IMHO, is a simpleton driver that uses memory as a device and reads/write to it. One such driver is beautifully explained in third chapter of LDD3e.
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