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In-Reply-To: <BC8902B1-E1E3-47F5-97D0-2205F9AADACC@supercoders.com.au>
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From: William Pitcock <nenolod@dereferenced.org>
Date: Sun, 7 Jan 2018 13:24:56 -0600
Message-ID: <CA+T2pCFfBm2aT4MWX81L_kiHTVsPJ05b8u3eAmU9_LjZB3+iMA@mail.gmail.com>
Subject: Re: [alpine-user] Multiple initramfs appears not to work
To: Andrew Stuart <andrew.stuart@supercoders.com.au>
Cc: alpine-user@lists.alpinelinux.org
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Hi,

On Tue, Jan 2, 2018 at 1:33 PM, Andrew Stuart
<andrew.stuart@supercoders.com.au> wrote:
> Hi folks,
>
> I want to pass multiple initramfs file to Alpine on boot.
>
> The architecture document says it supports such behaviour:
> https://wiki.alpinelinux.org/wiki/Architecture

Unfortunately that page needs to be deleted, because it's basically
fantasy land.

> "The kernel will decompress the stream of compressed cpio archives passed=
 to it by the 'append' bootloader option to the root of 'rootfs', a tmpfs a=
utomatically mounted at '/' by the kernel at boot."
>
> As far as I can tell, Alpine appears to ignore all except the first initr=
amfs.

That is because the bootloader and kernel do not really work this way.
I spent several months trying to explain this to the author of that
Wiki page.

> I=E2=80=99ve searching the web extensively to find any syslinux.cfg examp=
le that does this for Alpine Linux but can find none, so I=E2=80=99m wonder=
ing if it has ever been tested or known to work.
>
> I=E2=80=99ve tried a variety of different ways of specifying in syslinux.=
cfg but none of them seem to work. Here is an example of one such config.
>
> SERIAL 0 115200
> TIMEOUT 20
> PROMPT 1
> DEFAULT virthardened
>
> LABEL virthardened
> MENU LABEL Linux virthardened
> KERNEL /boot/vmlinuz-virthardened
> INITRD /boot/initramfs-virthardened,/boot/rootfs_overlay_initramfs.gz
> DEVICETREEDIR /boot/dtbs
> APPEND modules=3Dloop,squashfs,sd-mod,usb-storage quiet console=3Dtty0 co=
nsole=3DttyS0,115200
>
> Is anyone able to help me get Alpine to load more than one initramfs?

It is not really possible, sorry.

William


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