Windows error 0xEFFFFFFF, -268435457

GNU-C toolchain setup.c issue for ARM Cortex M3

I am using an ARM M3 based MCU, CC2538. I use Code Composer Studio v6 as an IDE. When I select GNU v4.7.4 (Linaro) as a compiler, I get a warning message that " selected device does not currently provide project initialization details to the GNU toolchain". I assume it [...] read more

CentOS reporting lower total memory compared others in AWS

I have a t2.medium instance running in AWS on the CentOS 7 AMI and I noticed in top and free it's basically reporting 3.45GiB of total memory. If I launch an instance with the AWS linux (I think I tried the RedHat one too) it reports about 4GiB of memory. [...] read more

Bitwise AND in Java Hashtable hash lookups?

I noticed that the hash function code as part of java.util.Hashtable#get(K key) does the following: int index = (hash & 0x7FFFFFFF) % tab.length;. Is this binary 'and' operation meant only to reset the sign bit? and therefore avoid negative table access. UPDATE: the fact that they 'and' with a 0x7FFFFFFF [...] read more

Java Bitwise AND operator

I'm trying to mask an integer in order to separate each byte individually like so: int a = (0xffffffff & 0xff000000) >> 24; int b = (0xffffffff & 0x00ff0000) >> 16; int c = (0xffffffff & 0x0000ff00) >> 8; int d = 0xffffffff & 0x000000ff; b, c and d give [...] read more

FreeBSD seems doesn't see my dlink wlan at all

I have a PC with a Dlink wireless PCI device in PCI slot. The LEDs are blinking, but when I boot FreeBSD I can not see the device in dmesg. Why? is it a BIOS issue? It's pretty ancient hardware. I don't know from where to start dig a problem [...] read more

How to find the address of a local variable and display its value from a disassembled function from a core dump

I am using the crash utility to investigate a core file dump. From this core dump, I can see that one processes has two deadlocked threads. The cause of the deadlock seems to be task->mm->mmap_sem being held for way too long while trying to serve a page fault. I am [...] read more

Xen VM continuously restarts and kernel fails to start init

I am using a VM built using the Xen hypervisor and libvirt management layer. I couldn't connect to the VM after updating the Debian verison from 8 to 9 so I tried logging into the physical machine the VM is running on and restarting the VM with virsh. However, after [...] read more

Can't connect to AWS instance after import with stock Centos7

I am trying to import a Centos7 based VM into Amazon AWS. The VM was created with the Centos7 minimal ISO installed into VirtualBox. Networking in the VM works fine locally before trying to do the import. I am using the EC2 command line tools to do the import: ec2-import-instance [...] read more

My dGPU (Nvidia GTX 880M) looks dead, any hope?

Yesterday I started playing Kenshi (interesting game btw), and after some time it crashed. I had no overheating problem (far from that), nothing is overclocked on my laptop, and my not-so-young GTX 880M was still more than capable of running it, but at this point it seems it stopped working. [...] read more

Computer randomly freezes one app at a time

The problem My PC (Windows 10) randomly freezes a few times a day, first the app which is focused at the moment, then anything I try to interact with, from other apps to the Start Menu. During those freezes, I can't open any other app, not even the Task Manager [...] read more

Setting up Ubuntu-Server with intel GPU for custom resolution

Short Version: How can I disable the DisplayPort and display-cloning completely and only use VGA with a custom resolution of 1920x240 (15KHz) on a CRT. Might involve the creation of a custom xorg.conf -------------------------------------------------------------------------------- Long Version: I'm struggeling with a RetroPie installation in Ubuntu Server that I'd like to use [...] read more

Linux memory manager infringes on PCI memory

My board has a Cavium Octeon NPU, running Linux kernel 2.6.34.10 that acts as a PCIe Root Complex. It is connected to PCIe switch, as are some other peripheral devices (Endpoints), among which there is Marvell's 9143 PCI-to_SATA controller based SSD. When PCIe is initially enumerated, PCI driver on Octeon [...] read more

"No inittab file found" after reset

An old dedicated server (Debian with Raid1) wasn't responding today and now can't boot after manual reset. Last message is > No inittab file found. I still have access to filesystem via rescue system. Ran fsck and checked raid (both arrays are clean). Booting 'Debian GNU/Linux, kernel 2.6.26-2-amd64 Default' root [...] read more

How to talk on both port using dual serial port PCI card on linux?

I am using MosChip MCS9865. It has two serial ports and I figured out how to talk through one of the serial port using sudo setserial /dev/ttyS0 uart 16550A command. That works great on one serial port, but now I need to talk through the other serial port. For some [...] read more

PCI serial card won't talk on Linux system?

I am running Mageia Linux and I have a PCI card with 2 serial ports and my motherboard (ASUS H81M-A) doesn't have any onboard serial port. The PCI card is manufactured by WCH it seems. I tried to install the Linux Driver that came with the card, but my system [...] read more

Suspend does not work on Debian Jessie

Today I observed that suspend sometimes does not work properly in freshly installed Debian Jessie. After executing suspend (Alt + Shut Down button) the following message appears on black screen: Loading, please wait... The syslog is as follows. I kindly as for any suggestions. Jul 12 18:53:10 svarog kernel: [ [...] read more

pm-hibernate does not turn off system

I'm trying to make pm-hibernate to work on my Ubuntu 14.04 system. When I invoke sudo pm-hibernate display turns off and I can't do anything anymore but computer does not turn off. All I have found in logs is: Mar 17 21:40:25 dmitry-pc kernel: [ 0.000000] PM: Registered nosave memory: [...] read more