Questions tagged [uclinux]

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can XIP kernel execute both normal exe and XIP exe?

I'm using linux kernel + busybox rootfs on an mmu-less device (stm32f429 custom board). I want to compile my kernel to execute in place (XIP). after booting it how can I specify which executable ...
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0answers
281 views

Linux kernel cannot execute any binary (error -12)

Problem: Memory Allocation Problem my platform: SOC = STM32H743 (ARMv7E-M | Cortex-M7) Board = Waveshare CoreH7XXI Linux Kernel = 5.8.10 (stable 2020-09-17) initial defconfig file = stm32_defconfig ...
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1answer
580 views

Can we run Linux on nucleo-stm32F429zi board?

I understand that the stm32nucleoF429zi doesn't have hardware MMU but we can disable the MMU option from the Linux kernel configuration option. If we do so then why can't we run Linux on stm32 F429zi? ...
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1answer
41 views

does Barebox bootloader works on cortex m4?

I want to boot uCLinux on the stm32f4 but I don't have enough knowledge about Barebox. is it possible to port Barebox for cortex m4? if yes, how?
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1answer
90 views

Blocking ports with iptables 1.4.2

I am trying to block some ports on an embeded uClinux· The Iptables version is 1.4.2. The command I used was iptables -I INPUT -p tcp --dport 22 -j DROP But it seems that iptables 1.4.2 is not ...
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0answers
52 views

Minimum ram we can achieve with Linux only blinking led

I heard of uclinux and Linux tiny project are very ambitious projects. It uses concept called XiP to reduce memory footprint. We can strip down binary and storage is less of a problem but connection ...
0
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1answer
2k views

uCLinux (linux 4.9 nommu) VFS: Cannot open root device "(null)"

I'm stuck with this kernel panic. What I want is to embed an initramfs into the kernel xip Image, but linux panic and tell me to pass a valid "root=" rootfs value. But WHY does Linux look for this ...
1
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1answer
125 views

Determing if an embedded Linux system runs uClinux

I have an ARM Linux system running kernel version 2.4, but I'm not sure if the processor has a memory-management unit, so how can I tell whether the system is running a uClinux kernel or a vanilla ...
10
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1answer
14k views

How to find processes using serial port

I'm using uclinux and I want to find out which processes are using the serial port. The problem is that I have no lsof or fuser. Is there any other way I can get this information?
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91 views

Add a driver module to embedded linux

I have a task that consists in implementing a driver for an RF module. The RF module communicate with the blackFin609 microcontroller using UART. In a first step i created a uClinux image and ...
3
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1answer
780 views

What is being cached?

I have an embedded system with a low amount of memory. The system has allocation issues. Maybe due to fragmentation: Memory allocation issue on NOMMU? The platform is a NOMMU platform and so I suspect ...
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460 views

Memory allocation issue on NOMMU?

I have a memory allocation issue on an embedded NOMMU linux. Or that is, I might have an issue, I'm not sure. The system has 15M free ram when booted. I have one small app (a Dropbox/REST ...