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