Questions tagged [uclinux]

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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 ...
1
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1answer
44 views

can we run linux in nucleo-stm32F429zi?

I understand that the stm32nucleoF429zi doesn't have hardware mmu but we can disable the MMU from the linux kernel configuation option. If we do so then why can't we run linux on stm32 F429zi? Why we ...
0
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1answer
10 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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14 views

Can I build μClinux with yocto?

I'm new to μClinux and from what I've read, the best way to build Linux for embedded systems is to use yocto. I want to build μClinux for stm32f407. It's equipped with a Cortex-M4 and does not have ...
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0answers
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can I use every Linux software and library on uClinux?

my CPU is stm32f4 cortex m4 with an external DRAM and SD Card. note: cortex m4 doesn't support MMU. it means it has no hardware memory management/protection system. and uClinux is designed to run on ...
0
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1answer
68 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 ...
2
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0answers
47 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
1k 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 ...
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1answer
97 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 ...
7
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1answer
11k 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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0answers
90 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
717 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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0answers
440 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 ...