README
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- Linux 2.4 on the CRIS architecture
- ==================================
- $Id: README,v 1.7 2001/04/19 12:38:32 bjornw Exp $
- This is a port of Linux 2.4 to Axis Communications ETRAX 100LX embedded
- network CPU. For more information about CRIS and ETRAX please see further
- below.
- In order to compile this you need a version of gcc with support for the
- ETRAX chip family. Please see this link for more information on how to
- download the compiler and other tools useful when building and booting
- software for the ETRAX platform:
- http://developer.axis.com/doc/software/devboard_lx/install-howto.html
- <more specific information should come in this document later>
- What is CRIS ?
- --------------
- CRIS is an acronym for 'Code Reduced Instruction Set'. It is the CPU
- architecture in Axis Communication AB's range of embedded network CPU's,
- called ETRAX. The latest CPU is called ETRAX 100LX, where LX stands for
- 'Linux' because the chip was designed to be a good host for the Linux
- operating system.
- The ETRAX 100LX chip
- --------------------
- For reference, plase see the press-release:
- http://www.axis.com/news/us/001101_etrax.htm
- The ETRAX 100LX is a 100 MIPS processor with 8kB cache, MMU, and a very broad
- range of built-in interfaces, all with modern scatter/gather DMA.
- Memory interfaces:
- * SRAM
- * NOR-flash/ROM
- * EDO or page-mode DRAM
- * SDRAM
- I/O interfaces:
- * one 10/100 Mbit/s ethernet controller
- * four serial-ports (up to 6 Mbit/s)
- * two synchronous serial-ports for multimedia codec's etc.
- * USB host controller and USB slave
- * ATA
- * SCSI
- * two parallel-ports
- * two generic 8-bit ports
-
- (not all interfaces are available at the same time due to chip pin
- multiplexing)
- The previous version of the ETRAX, the ETRAX 100, sits in almost all of
- Axis shipping thin-servers like the Axis 2100 web camera or the ETRAX 100
- developer-board. It lacks an MMU so the Linux we run on that is a version
- of uClinux (Linux 2.0 without MM-support) ported to the CRIS architecture.
- The new Linux 2.4 port has full MM and needs a CPU with an MMU, so it will
- not run on the ETRAX 100.
- A version of the Axis developer-board with ETRAX 100LX (running Linux
- 2.4) is now available. For more information please see developer.axis.com.
- Bootlog
- -------
- Just as an example, this is the debug-output from a boot of Linux 2.4 on
- a board with ETRAX 100LX. The displayed BogoMIPS value is 5 times too small :)
- At the end you see some user-mode programs booting like telnet and ftp daemons.
- Linux version 2.4.1 (bjornw@godzilla.axis.se) (gcc version 2.96 20000427 (experimental)) #207 Wed Feb 21 15:48:15 CET 2001
- ROM fs in RAM, size 1376256 bytes
- Setting up paging and the MMU.
- On node 0 totalpages: 2048
- zone(0): 2048 pages.
- zone(1): 0 pages.
- zone(2): 0 pages.
- Linux/CRIS port on ETRAX 100LX (c) 2001 Axis Communications AB
- Kernel command line:
- Calibrating delay loop... 19.91 BogoMIPS
- Memory: 13872k/16384k available (587k kernel code, 2512k reserved, 44k data, 24k init)
- kmem_create: Forcing size word alignment - vm_area_struct
- kmem_create: Forcing size word alignment - filp
- Dentry-cache hash table entries: 2048 (order: 1, 16384 bytes)
- Buffer-cache hash table entries: 2048 (order: 0, 8192 bytes)
- Page-cache hash table entries: 2048 (order: 0, 8192 bytes)
- kmem_create: Forcing size word alignment - kiobuf
- kmem_create: Forcing size word alignment - bdev_cache
- Inode-cache hash table entries: 1024 (order: 0, 8192 bytes)
- kmem_create: Forcing size word alignment - inode_cache
- POSIX conformance testing by UNIFIX
- Linux NET4.0 for Linux 2.4
- Based upon Swansea University Computer Society NET3.039
- Starting kswapd v1.8
- kmem_create: Forcing size word alignment - file lock cache
- kmem_create: Forcing size word alignment - blkdev_requests
- block: queued sectors max/low 9109kB/3036kB, 64 slots per queue
- ETRAX 100LX 10/100MBit ethernet v2.0 (c) 2000 Axis Communications AB
- eth0 initialized
- eth0: changed MAC to 00:40:8C:CD:00:00
- ETRAX 100LX serial-driver $Revision: 1.7 $, (c) 2000 Axis Communications AB
- ttyS0 at 0xb0000060 is a builtin UART with DMA
- ttyS1 at 0xb0000068 is a builtin UART with DMA
- ttyS2 at 0xb0000070 is a builtin UART with DMA
- ttyS3 at 0xb0000078 is a builtin UART with DMA
- Axis flash mapping: 200000 at 50000000
- Axis flash: Found 1 x16 CFI device at 0x0 in 16 bit mode
- Amd/Fujitsu Extended Query Table v1.0 at 0x0040
- Axis flash: JEDEC Device ID is 0xC4. Assuming broken CFI table.
- Axis flash: Swapping erase regions for broken CFI table.
- number of CFI chips: 1
- Using default partition table
- I2C driver v2.2, (c) 1999-2001 Axis Communications AB
- ETRAX 100LX GPIO driver v2.1, (c) 2001 Axis Communications AB
- NET4: Linux TCP/IP 1.0 for NET4.0
- IP Protocols: ICMP, UDP, TCP
- kmem_create: Forcing size word alignment - ip_dst_cache
- IP: routing cache hash table of 1024 buckets, 8Kbytes
- TCP: Hash tables configured (established 2048 bind 2048)
- NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
- VFS: Mounted root (cramfs filesystem) readonly.
- Init starts up...
- Mounted none on /proc ok.
- Setting up eth0 with ip 10.13.9.116 and mac 00:40:8c:18:04:60
- eth0: changed MAC to 00:40:8C:18:04:60
- Setting up lo with ip 127.0.0.1
- Default gateway is 10.13.9.1
- Hostname is bbox1
- Telnetd starting, using port 23.
- using /bin/sash as shell.
- sftpd[15]: sftpd $Revision: 1.7 $ starting up
- And here is how some /proc entries look:
- 17# cd /proc
- 17# cat cpuinfo
- cpu : CRIS
- cpu revision : 10
- cpu model : ETRAX 100LX
- cache size : 8 kB
- fpu : no
- mmu : yes
- ethernet : 10/100 Mbps
- token ring : no
- scsi : yes
- ata : yes
- usb : yes
- bogomips : 99.84
- 17# cat meminfo
- total: used: free: shared: buffers: cached:
- Mem: 7028736 925696 6103040 114688 0 229376
- Swap: 0 0 0
- MemTotal: 6864 kB
- MemFree: 5960 kB
- MemShared: 112 kB
- Buffers: 0 kB
- Cached: 224 kB
- Active: 224 kB
- Inact_dirty: 0 kB
- Inact_clean: 0 kB
- Inact_target: 0 kB
- HighTotal: 0 kB
- HighFree: 0 kB
- LowTotal: 6864 kB
- LowFree: 5960 kB
- SwapTotal: 0 kB
- SwapFree: 0 kB
- 17# ls -l /bin
- -rwxr-xr-x 1 342 100 10356 Jan 01 00:00 ifconfig
- -rwxr-xr-x 1 342 100 17548 Jan 01 00:00 init
- -rwxr-xr-x 1 342 100 9488 Jan 01 00:00 route
- -rwxr-xr-x 1 342 100 46036 Jan 01 00:00 sftpd
- -rwxr-xr-x 1 342 100 48104 Jan 01 00:00 sh
- -rwxr-xr-x 1 342 100 16252 Jan 01 00:00 telnetd
- (All programs are statically linked to the libc at this point - we have not ported the
- shared libraries yet)