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Introduction------------
This configuration offers a cross-build of (a subset of) the build-bootstrappackage selection for the sparc architecture as emulated by qemu-system-sparc.It includes support for most of the hardware emulated by qemu, a working udev,kernel and userland support for TCP/IP networking, and more.
With qemu and the resulting build you can at least:- boot the kernel and first stage initrd,- execute a shell from the initrd,- mount NFS file systems,- load the second stage from a CD-ROM or HTTP server,- and install packages from the CD on a hard disc.
The packages included should be sufficient for native builds on the targetedplatform.
Quick Start-----------
- Boot from CD with framebuffer (PROM console): qemu-system-sparc -cdrom bbs-sparc-qemu_cd1.iso -hda /srv/qemu.hda \ -boot d
- Boot from CD with serial console: qemu-system-sparc -cdrom bbs-sparc-qemu_cd1.iso -hda /srv/qemu.hda \ -boot d -append "console=ttyS0 video=tcxfb:off" -nographic
Hints And Known Bugs--------------------
- To use the CD image in qemu, create it after the build has finished: ./scripts/Create-ISO bbs-sparc-qemu bbs-sparc-qemu
- To use a hard disk in qemu, create it with e.g.: qemu-img create /srv/qemu.hda 2048M
- When using a console on the serial port, be sure to enter 'ttyS0' as the terminal device in boot stage 2, or you won't get to see the command line.
- glibc26 does not build for sparc with -Os because extern inline functions are not used when optimizing for size, resulting in a missing __ieee754_sqrtl function for libm_pic.a; glibc-2.6/sysdeps/sparc/sparc32/fpu/e_sqrtl.c is compiled but glibc-2.6/sysdeps/sparc/sparc32/soft-fp/q_sqrt.c contains the actual __ieee754_sqrtl function.
- the SCSI support in kernel is not compiled as a module because udev can't load it automatically, and loading it and creating the /dev entries manually, the SCSI devices don't work. Furthermore, if partitioning a previously empty hard disk, the new partitions won't show up until after a reboot.
- the size of the uncompressed kernel image (/boot/image) is limited to 2,5 MB when booting with silo. Because of this limit the framebuffer driver is not compiled into the kernel (and cannot be compiled as a module).
- strace does not (cross-)build for sparc yet.
- To access HTTP or NFS servers in qemu, add the following options: -net nic -net tap
You need root privileges for this, or have your system administrator set it up for you. When qemu starts it will create a network interface (tap0) on the host system and add an IP address/netmask (172.20.0.1/16) to it:
host:/# ip addr show dev tap0 19: tap0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500 link/ether 00:ff:e1:75:9a:a0 brd ff:ff:ff:ff:ff:ff inet 172.20.0.1/16 brd 172.20.255.255 scope global tap0 inet6 fe80::2ff:e1ff:fe75:9aa0/64 scope link valid_lft forever preferred_lft forever
In the first boot stage of the emulated system, execute a shell, set up the network link and add an IP address on the same network:
sh-3.2# ip link set up dev eth0 [ 41.026595] eth0: link up sh-3.2# ip addr add 172.20.0.20/16 dev eth0
You should now be able to reach the host system:
sh-3.2# ping -c3 172.20.0.1 PING 172.20.0.1 (172.20.0.1): 56 octets data 64 octets from 172.20.0.1: icmp_seq=0 ttl=64 time=16.7 ms 64 octets from 172.20.0.1: icmp_seq=1 ttl=64 time=1.6 ms 64 octets from 172.20.0.1: icmp_seq=2 ttl=64 time=1.1 ms --- 172.20.0.1 ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max = 1.1/6.4/16.7 ms
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