blog.crox.net

I wanted to try the new 2.6.25 kernel on a Sunblade 100 I'm reinstalling. But immediately after entering "make" I got the following error:

arch/sparc64/kernel/asm-offsets.c:1: error: -m64 is not supported by this configuration
arch/sparc64/kernel/asm-offsets.c:1: error: -mlong-double-64 not allowed with -m64
arch/sparc64/kernel/asm-offsets.c:1: error: -mcmodel= is not supported on 32 bit systems
make[1]: *** [arch/sparc64/kernel/asm-offsets.s] Error 1
make: *** [prepare0] Error 2

I found the solution here, along with the explanation. To make it short, to get it to work, for now you'll have to type:

 # CROSS_COMPILE=sparc64-unknown-linux-gnu- make

Initially written on 2006-05-17

On my other (x86/amd64) diskless machines, I use PXE with pxegrub. My setup is quite similar to (and inspired by) this one.

Now, on sparc machines, there is no BIOS nor PXE. But you don't need all that, since you have the Open Boot... This is how I managed to make my Sunblade 100 totally diskless (using a "vanilla" kernel, the latest version being currently 2.6.16.16).

Note: In this example, 10.0.0.10 will be my dhcp/nfs/tftp server which I will refer to as 'fileserver'. 10.0.0.30 is the sunblade.

- when configuring the kernel:

[*] Default bootloader kernel arguments (ip=dhcp root=/dev/nfs nfsroot=10.0.0.10:/diskless/sunblade)

(in "Networking" -> "Networking support" -> "Networking options")

[*]   IP: kernel level autoconfiguration
 [*]     IP: DHCP support
 [*]     IP: BOOTP support
 [*]     IP: RARP support

(in "File systems" -> "Network File Systems")

<*> NFS file system support
[*]   Provide NFSv3 client support
[*] Root file system on NFS

Configure all other settings as you would do for a disk install, but make sure you compile your NIC driver in the kernel (not as module)

Then:

make
make modules_install
make tftpboot.img ROOT_IMG=/dev/null

(the resulting tftpboot.img will be in arch/sparc64/boot/tftpboot.img)

I copied tftpboot.img to fileserver as tftpimage-2.6.16.16, and added the following entry in my dhcpd.conf:

host sunblade {
    hardware ethernet 00:03:BA:08:12:34;
    fixed-address 10.0.0.30;
    always-reply-rfc1048 on;
    filename "sunblade/boot/tftpimage-2.6.16.16";
}

Finally, to net-boot your diskless Sunblade you'll need to enter

boot net:dhcp

in the Open Boot prompt. When you are happy with it, you can set it as default:

setenv boot-device net:dhcp cdrom disk net

Notes:

- apparently, instead of using make tftpboot.img you can just "elftoaout" vmlinux

- another alternative would be to use tilo, which comes with silo, to build the image

If you get this:

[blocks B ] sys-devel/gcc-sparc64 (is blocking sys-devel/kgcc64-3.4.6)

Check this thread on the gentoo forums:

There are a couple of architectures on Gentoo that have a 32-bit userland, but need a 64-bit kernel compiler. kgcc64 is an attempt to provide one package for all of those architectures rather than the gcc- packages that exist now. The way we migrated over to this caused the issue you are seeing.

Basically, you'll need to

emerge --unmerge gcc-sparc64 && emerge sys-devel/kgcc64