From: "Emmanuel Blot" <eblot.ml@gmail.com>
To: ~alpine/users@lists.alpinelinux.org
Cc: atlury@gmail.com
Subject: Issue with booting Alpine on an ARM SBC over the network
Date: Fri, 06 Sep 2019 16:02:00 +0200
Message-ID: <3FF31619-6191-4FE4-BA8B-A89439F59C97@gmail.com>
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<p dir=3D"auto">Hi,</p>

<p dir=3D"auto">I=E2=80=99d like to boot an Orange Pi Zero SBC over the n=
etwork (PXE-like boot)</p>

<p dir=3D"auto">I have first downloaded and successfully booted and used =
the ARM vanilla<br>
image on the OPi0, including networking, from the MMC device, to ensure<b=
r>
a regular boot from a MMC card was Ok.</p>

<p dir=3D"auto">Next I have:</p>

<ul>
<li>installed uboot on OPi0 embedded SPI, and booted it up w/o any MMC</l=
i>
<li>installed and run a small bootp/dhcp/pxe/tftp/http server on a local =
host
to allocate IP through DHCP and serve files to the OPi0 overt TFTP &amp; =
HTTP.</li>
<li>added the missing drivers to the initramfs file (namely: dwmac_sun8i,=

mdio_mux, stmmac_platform, stmmac and af_packet)</li>
<li>built the uBoot-compatible initramfs file</li>
</ul>

<p dir=3D"auto">I=E2=80=99m now able to boot up the Alpine vanilla kernel=
, that is<br>
  vmlinuz + modified uinitrd + OPi0 DTB.</p>

<p dir=3D"auto">However, I do not see a way to provide Alpine Linux w/ a =
modloop file: even<br>
if it could be (inefficiently) downloaded over TFTP, I did not find a way=
 to<br>
specify the modloop file as a preloaded RAM area.<br>
=46rom <a href=3D"https://wiki.alpinelinux.org/wiki/PXE_boot#HOWTO" style=
=3D"color:#3983C4">https://wiki.alpinelinux.org/wiki/PXE_boot#HOWTO</a>, =
it appears the proper<br>
way is to serve it over HTTP. So far, so good.</p>

<p dir=3D"auto">Nevertheless, it seems that the modloop=3D kernel argumen=
t does nothing: it<br>
does not trigger any attempt to download a file over HTTP.</p>

<p dir=3D"auto">To sum up, I have defined the boot environment as:</p>

<p dir=3D"auto">dhcp ${kernel_addr_r} boot/vmlinuz-vanilla<br>
  dhcp ${ramdisk_addr_r} boot/uinitramfs-vanilla-net<br>
  dhcp ${fdt_addr_r} boot/dtbs/sun8i-h2-plus-orangepi-zero.dtb</p>

<p dir=3D"auto">setenv bootargs "bootargs=3Dearlyprintk<br>
                   console=3DttyS0,115200<br>
                   modules=3Dloop,dwmac-sun8i<br>
                   ip=3D${ipaddr}::${gatewayip}:${netmask}:opi0:eth0:none=
<br>
                   modloop=3Dhttp://${serverip}:8000/boot/modloop-vanilla=
<br>
                   apkovl=3Dhttp://${serverip}:8000/alpine.apkovl.tar.gz"=
</p>

<p dir=3D"auto">bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}</p=
>

<p dir=3D"auto">The TCP/IP stack and wget work as expected, as alpine.apk=
ovl.tar.gz is<br>
successfully downloaded (apkovl=3D argument).</p>

<p dir=3D"auto">However, no trace about the modloop=E2=80=A6 What did I m=
iss? I did not find a<br>
reference to this argument in the init script BTW.</p>

<p dir=3D"auto">These are the last lines of the boot sequence trace messa=
ge:</p>

<ul>
<li>Mounting boot media: [    2.920674] sunxi-mmc 1c0f000.mmc: Linked as =
a consumer to regulator.2
[    2.929237] sunxi-mmc 1c0f000.mmc: Got CD GPIO
[    2.957549] sunxi-mmc 1c0f000.mmc: initialized, max. request size: 163=
84 KB
[    2.965675] sunxi-mmc 1c10000.mmc: Linked as a consumer to regulator.4=

[    2.973525] sunxi-mmc 1c10000.mmc: Dropping the link to regulator.4
ok.</li>
<li>Setting IP (eth0)...: [    8.428907] sunxi-mmc 1c10000.mmc: Linked as=
 a consumer to regulator.4
[    8.437202] Generic PHY 0.1:01: attached PHY driver <a href=3D"mii_bus=
:phy_addr=3D0.1:01,%20irq=3DPOLL" style=3D"color:#3983C4">Generic PHY</a>=

[    8.437723] sunxi-mmc 1c10000.mmc: Dropping the link to regulator.4
[    8.456542] dwmac-sun8i 1c30000.ethernet eth0: No Safety Features supp=
ort found
[    8.463882] dwmac-sun8i 1c30000.ethernet eth0: No MAC Management Count=
ers available
[    8.471591] dwmac-sun8i 1c30000.ethernet eth0: PTP not supported by HW=

ok.
Connecting to 10.113.141.152:8000 (10.113.141.152:8000)
[   12.645254] dwmac-sun8i 1c30000.ethernet eth0: Link is Up - 100Mbps/Fu=
ll - flow control rx/tx
alpine.apkovl.tar.gz 100% |********************************|   611  0:00:=
00 ETA</li>
<li>Loading user settings from /tmp/alpine.apkovl.tar.gz: ok.</li>
<li>Installing packages to root filesystem: OK: 0 MiB in 0 packages
ok.
grep: /sysroot/etc/inittab: No such file or directory
/sbin/init not found in new root. Launching emergency recovery shell
Type exit to continue boot.
sh: can't access tty; job control turned off
/ #</li>
</ul>

<p dir=3D"auto">Thanks,<br>
Emmanuel.<br>
=E2=80=8B</p>
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