LINUX/PA-RISC NFSROOT HOWTO
(Or how to get to a working shell prompt)
YOU NEED:
A fresh linux-2.3 checkout from CVS
The .config included below
puffin.external.hp.com/pub/parisc/binaries/nfsroot/nfsroot-20000214.tar.gz
A supported PA-RISC box with serial console
A Linux (any Unix will do) server with NFS server, bootpd and tftpd
Note on consoles:
Yes, you *will* need serial console on the PA-RISC box. IODC console
was a quick hack to get output during development, but it will never
be usable as an interactive console. When HP releases docs for STI we
will implement a proper framebuffer console. Until then, serial is
the only option. Sorry.
Futhermore this will only work on boxes with LASI. I'm still working
on support for the NS87560UBD Super I/O chip on [BCJ]x000 boxes.
STEP 1. KERNEL BUILDING
Get the latest linux-2.3 tree from CVS.
a) If you use the standard boot loader
Edit DEFAULT_COMMANDLINE in linux-2.3/arch/parisc/boot/boot_code/ipl_c.c
to read:
"vmlinux HOME=/ TERM=LINUX root=/dev/nfs nfsroot=10.0.0.1"
b) If you use PALO
Edit the echo line in palo/mklifimage to read
"vmlinux HOME=/ TERM=LINUX root=/dev/nfs nfsroot=10.0.0.1"
In both cases replace 10.0.0.1 with the IP address of your NFS server.
Copy the .config included below to the root of the linux source tree.
make oldconfig
make dep
make clean
make Image (Or make palo, if you use Paul's loader)
Due to linker issues cross compiling is still not possible. I.e. you
have to build on HP/UX.
STEP 2. BOOTP, TFTP AND NFS
Copy linux-2.3/arch/parisc/boot/Image (or palo/lifimage) to
/tftpboot/vmlinux on the server. Make sure the file is world
readable.
Edit /etc/bootptab on the server. I have an entry like this:
mybox:\
:hd=/tftpboot:\
:bf=vmlinux:\
:ht=ether:\
:ha=0060b007e4ab:\
:sm=255.255.255.0:\
:hn:\
:ip=10.0.0.6:\
:vm=rfc1048:
Replace ``mybox'' with the hostname of your PA-RISC box.
You need to insert the MAC address of the PA-RISC box in the ha=
field. You can find the MAC by typing "in la" at the PDC prompt.
You should also change the IP to something appropriate for your LAN.
Add an entry for the host in /etc/hosts.
Unpack the nfsroot tarball in /tftpboot and rename the unpacked
directory (mybox) to the hostname of your box.
Make sure both bootps and tftp are enabled in /etc/inetd.conf.
Edit your /etc/exports to contain a line like this:
/tftpboot/mybox mybox(rw,no_root_squash)
Again, replace mybox with your hostname.
Restart inetd and nfs services if you made any modifications.
STEP 3. GO
Type "bo lan" at the PDC prompt on the PA-box and kapow. You've got a
prompt (I hope).
Here's what I get...
---8<---
Stand-alone shell (version 3.4)
500 5 1970 53b
> -mount -t proc proc /proc
quux
quuux
> -more /proc/cpuinfo
quux
quuux
<< cpuinfo >>
processor : 0
cpu family : PA-RISC <NULL>
cpu : PA8000
cpu MHz : 160.000000
cpu category : category A
cpu level : level 0
cpu shadow regs : no
model :
model name : Raven U 160 (9000/780/C160)
sw_id : 0
hversion : 0x00000000
sversion : 0x00000000
I-cache : 0 KB
D-cache : 0 KB (WB)
ITLB entries : 0
DTLB entries : 0
BTLB : not supported
---8<---
-- Martin Kasper Petersen BOFH, IC1&2, Aalborg University, DK mailto:mkp@SunSITE.auc.dk http://SunSITE.auc.dk/~mkp/