Introduction

This architecture is for 32-bit Intel/AMD x86 machines and 32 bit IOT x86 boards (like Intel Edison).

Version 7.1804 is the Fifth major release of the 32 bit x86 by the AltArch Special Interest Group. This release is based on the Source Code from CentOS 7 (1804) x86_64 Architecture and includes all current updates from the main CentOS 7.1804 tree.

Versions Released:
7.1804 - Based on Source Code for Red Hat Enterprise Linux 7.5 - Current
7.1708 - Based on Source Code for Red Hat Enterprise Linux 7.4 - Archived
7.1611 - Based on Source Code for Red Hat Enterprise Linux 7.3 - Archived
7.1511 - Based on Source Code for Red Hat Enterprise Linux 7.2 - Archived
7.1503 - Based on Source Code for Red Hat Enterprise Linux 7.1 - Archived

Known Issues

Exit issue on GNOME

There was a known issue that GNOME will not exit after logon (in version 7.1503). This caused the error described in CentOS Bug 8834.

<!> This issue is now fixed in 7.1708, please see the bug link above for 7.1503

CPU selection in some versions of QEMU/KVM

In some versions of QEMU/KVM the default CPU for i386 is pentium2. This causes an error as described in CentOS Bug 8748

The workaround is to customize the CPU and pick copy host cpu in virt-manager.

Installation

Installation is performed via the install ISOs and is the same as described in the standard CentOS 7 installer articles.

Basically, boot one of the install ISOs and use the anaconda installer OR use a custom kickstart file.

Install ISOs are available here:

http://isoredirect.centos.org/altarch/7/isos/i386/

sha256sums

5d5a27fa6fdf38fc7e297a61df7749d7529c4e20974f44d8609b8e0ef0593fb7  CentOS-7-i386-Everything-1804.iso
ea3aeafb0c5554ed6aad84d8cddeda2144442de88f85351303f72fae897f5e15  CentOS-7-i386-Minimal-1804.iso
c364f9d8e1cd1d7bfe2b1054f7697ef4946590d4bc21e081eb39ab67dffa647d  CentOS-7-i386-NetInstall-1804.iso

Net Install ISO Path

If you are using the CentOS-7-i386-NetInstall ISO, please use a nearby AltArch mirror as the install source. Appending "7/os/i386/" to the mirror's URL will give you the correct URL that you can use in the installer. Alternatively, you can use http://mirror.centos.org/altarch/7/os/i386/ as the URL, but a nearby external mirror would probably be faster.

Getting involved

The i386 effort is being done as a community SIG project. Everyone is welcome to participate, though the actual builds are an artefact of the 64 bit process in that all 32 bit packages are built, but only some used as multi-lib in the 64 bit architecture. But we still need community help to maintain documentation and also fix issues that may arise in this architecture.

We encourage vendors to come and join this effort, especially for the newer 32-bit IOT boards like Intel Edison, etc.

The wider CentOS Ecosystem is also welcome to engage with us, both at the project and code level. If you are working with a project that interfaces, manages or develops on topĀ of CentOS, especially in the virtualization, cloud, container and infrastructure management areas - we would love to have you guys get involved.

Package Changes

Most packages are clean builds from the most recent release of CentOS 7, but there are some changed sources specifically for i386, as listed here:

centos-release

Modified for new altarch paths

efibootmgr

No secure boot for 32bit

efivar

No secure boot for 32bit

kernel

modified to build on the i686 arch

kexec-tools

No secure boot for 32bit

syslinux

modified to build on the i686 arch

grub2

modified to build on the i386 arch

Packages not in i686

The following packages exist in x86_64 but are not in i686:

Not In i686

(note: the i686.rpm in the name is for comparison only, these rpms do not exist as i686 rpms in the i386 Arch, but they do exist as .x86_64.rpm in the x86_64 Arch)

Experimental Repository

There is a repository in the i386 tree called experimental. This is where experimental stuff goes :). Right now it contains a very new kernel (currently 4.9.x) that might work better with newer IoT type boards like minnowboard, edison, jaguarboard, etc.

To enable the experimental repo, add a file called 'CentOS-Experimental.repo' to '/etc/yum.repo.d/' that contains this:

[experimental]
name=CentOS-$releasever - Experimental
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=experimental
#baseurl=http://mirror.centos.org/altarch/$releasever/experimental/$basearch/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

SpecialInterestGroup/AltArch/i386 (last edited 2018-10-05 13:11:45 by AnssiJohansson)