I wish to integrate Wifi module on my ARM920T having Linux Kernel 2.6.8.1.
I am presently working on my workstation which is a x86 system with kernel version 4.2.0-27-generic. I bought a TP-Link wifi module (TL-WN725N_V2_150911) and downloaded wifi driver from their official website http://www.tp-link.com/en/download/TL-WN725N.html#Driver for compatible OS Linux (kernel 2.6.18 ~ 3.19.3).
I was successfully able to install the module on my workstation and even got my wireless network working. I now need to port it on my target device of which I am provided the toolchain.
I have an idea of cross-compilation but not sure how new modules are integrated into the new kernel. Or may be silly doubts such as my workstation running a relatively new kernel would effect my development of modules for old kernel? Relatively new to Embedded Development, any guidance would be a pretty good learning experience.
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I'm running into a problem with dependencies with a backport driver and an existing old driver.
In the project I've to use an new Wifi Module. The old one should be also supported by the same kernel at the same time.
The new Wifi driver is provided by a backport package. To use this packport driver, the Kernel feature CONFIG_WIRELESS_EXT has to be disabled.
But the old Wifi driver requires the CONFIG_WIRELESS_EXT to be build.
So only one the drivers can be build against the statically configured kernel.
How can I build both drivers without changing the kernel configuration?
We are developing a multi-core processor with RISCV architecture.
We had already ported Linux for single-core RISCV processor and it is working on our own FPGA based board with busybox rootfs.
I want to port Linux for multi-core RISCV processor now.
My doubts are:
Whether the gnu-riscv-gcc toolchain available now supports multi-core?
Whether spike available now supports multi-core?
Should I make any change to the bbl bootloader (Berkely bootloader) to support multi-core?
What are the changes I should make for my single-core Linux kernel to support multi-core?
The current RISC-V ecosystem already supports SMP Linux.
No changes to the compiler are required for multicore.
Spike can simulate multicore when using the '-p' flag.
BBL supports multicore.
Before building linux, configure it to support SMP.
Any hiccups, are probably due to the toolchain out of sync with the newest privileged spec changes. Last Fall, users successfully built and ran multicore Linux on RISC-V.
This is all expected to work out of the box. My standard testing flow for Linux and QEMU pull requests is to boot a Fedora root filesystem on QEMU via Linux+BBL. Instructions can be found on the QEMU Wiki Article about RISC-V. This will boot in our "virt" board, which uses VirtIO based devices. These devices have standard upstream Linux drivers that are very well supported, so there isn't really any platform-level work to be done.
In addition to the standard VirtIO-based devices, SiFive has devices that are part of the Freedom SOC platform. If you platform differs significantly from SiFive's Freedom platform then you'll need some additional drivers in both Linux and BBL.
We maintain an out-of-tree version of the drivers we haven't cleaned up for upstream yet in freedom-u-sdk, which should give you a rough idea of how much work it is. Running make qemu in that repository will boot Linux on QEMU via BBL, and running make will show you how to flash an SD card image for the HiFive Unleashed board.
We are porting a solution to ARM that was originally designed to run on x86/x64 Debian based systems.
So far so good however along with this solution we ship out a printer that is compatible and comes with drivers for Linux (x86 and x64), unfortunately the manufacturer does not have ARM drivers for it, nor is capable of compiling some from source code (don't know why).
I've installed the printer with CUPS and used the x86 binary. But of course, whenever I send a task to the printer, the ARM system cannot use the binary and naturally CUPS reports:
/usr/lib/cups/filter/rastertotg2460 failed
I would like to know how I can run x86 binaries on ARM v6 based systems?
The ARM operating system is Raspbian running on a Raspberry Pi B+ board and the binaries (if you want to take a look) are here.
EDIT:
I was also made aware of this proprietary solution that claims to make it possible running x86 binaries on ARM systems, but all demonstrations are for ARM v7 systems, not sure if it will work on Raspbian with a Raspberry Pi B+ board.
I think this is going to require some serious work, but I had it the wrong way around initially.
Since you want to drive the printer, you're going to have to do the x86 emulation "inside" the CUPS system. It's not enough with a stand-alone x86 emulator, since those aim to give you a full x86 system with peripheral hardware and stuff. You don't need that, you just need to drive the printer.
I can imagine using some kind of x86 emulation library inside a CUPS "virtual" driver, which in turn loads the x86 binary you have and feeds it into the emulator. It would then need to expose the expected CUPS environment to the x86 code inside the emulator.
Something like Soft86 might be a good starting-point.
Yesterday I faced with an interview. In interview he asked me for steps to porting Linux on new board.
My answer was,
cross-compile u-boot for board architecture.
cross-compile kernel, with selecting driver for peripherals connected to board.
cross-compile filesystem, and port all on board.
But Interviewer is not happy with this answer.
Can you please suggest me which point were I missed out?
Thanks in advance.
Porting steps -
Install a cross-development environment.
Setup the board and ensure that the serial port is working so we can print data through the serial port.
Download and install the Linux kernel, most of the porting work will be done at this level.
Add board specific code into the kernel tree.
Build a kernel image to run on the board
Test that early kernel printk is working
Get the real printk working with the serial console.
For a new board, a new board-specific directory should be added as well as support for interrupt handling, kernel timer services and mapping for memory areas.
Ethernet drivers are usually the next drivers to focus on as they enable setup of NFS root file system to get access to user utilities and applications.
Filesystem can be provided in different forms which are listed on LinuxFilesystem
and I want to know if my chipset is capable off doing those things
My chipset is a intel centrino advanced 6200-n on a sony vayo laptop running on windows 7.
Now, I know that windows is only capable off listening, so I boot backtrack 4
from a usb stick.
I also want to know if a live distribution can work flawlessly with the wificard even if it does not support formentioned things, because I try'd to use wget to download something
and it says it ca not resolve the address?
thanks, Richard
Intel centrino advanced 6200-n does support both monitor mode and frame injection with iwlwifi driver. There are some intricacies involved on driver side though so it is best to use very recent kernel to make it work reliably. The patches which make this work well are expected to be part of Linux kernel version 3.5, until it's released you can build kernel yourself from iwlwifi.git tree:
http://git.kernel.org/?p=linux/kernel/git/iwlwifi/iwlwifi.git
Instructions on building kernel from a git tree:
https://wiki.ubuntu.com/KernelTeam/GitKernelBuild
It should also work with older kernels.
As for the fact that you couldn't wget something - have you connected to wireless network at all? Standard client mode in iwlwifi works very well even with old kernels.