1Linux 2.4 on the CRIS architecture 2================================== 3$Id: README,v 1.7 2001/04/19 12:38:32 bjornw Exp $ 4 5This is a port of Linux 2.4 to Axis Communications ETRAX 100LX embedded 6network CPU. For more information about CRIS and ETRAX please see further 7below. 8 9In order to compile this you need a version of gcc with support for the 10ETRAX chip family. Please see this link for more information on how to 11download the compiler and other tools useful when building and booting 12software for the ETRAX platform: 13 14http://developer.axis.com/doc/software/devboard_lx/install-howto.html 15 16<more specific information should come in this document later> 17 18What is CRIS ? 19-------------- 20 21CRIS is an acronym for 'Code Reduced Instruction Set'. It is the CPU 22architecture in Axis Communication AB's range of embedded network CPU's, 23called ETRAX. The latest CPU is called ETRAX 100LX, where LX stands for 24'Linux' because the chip was designed to be a good host for the Linux 25operating system. 26 27The ETRAX 100LX chip 28-------------------- 29 30For reference, plase see the press-release: 31 32http://www.axis.com/news/us/001101_etrax.htm 33 34The ETRAX 100LX is a 100 MIPS processor with 8kB cache, MMU, and a very broad 35range of built-in interfaces, all with modern scatter/gather DMA. 36 37Memory interfaces: 38 39 * SRAM 40 * NOR-flash/ROM 41 * EDO or page-mode DRAM 42 * SDRAM 43 44I/O interfaces: 45 46 * one 10/100 Mbit/s ethernet controller 47 * four serial-ports (up to 6 Mbit/s) 48 * two synchronous serial-ports for multimedia codec's etc. 49 * USB host controller and USB slave 50 * ATA 51 * SCSI 52 * two parallel-ports 53 * two generic 8-bit ports 54 55 (not all interfaces are available at the same time due to chip pin 56 multiplexing) 57 58The previous version of the ETRAX, the ETRAX 100, sits in almost all of 59Axis shipping thin-servers like the Axis 2100 web camera or the ETRAX 100 60developer-board. It lacks an MMU so the Linux we run on that is a version 61of uClinux (Linux 2.0 without MM-support) ported to the CRIS architecture. 62The new Linux 2.4 port has full MM and needs a CPU with an MMU, so it will 63not run on the ETRAX 100. 64 65A version of the Axis developer-board with ETRAX 100LX (running Linux 662.4) is now available. For more information please see developer.axis.com. 67 68 69Bootlog 70------- 71 72Just as an example, this is the debug-output from a boot of Linux 2.4 on 73a board with ETRAX 100LX. The displayed BogoMIPS value is 5 times too small :) 74At the end you see some user-mode programs booting like telnet and ftp daemons. 75 76Linux version 2.4.1 (bjornw@godzilla.axis.se) (gcc version 2.96 20000427 (experimental)) #207 Wed Feb 21 15:48:15 CET 2001 77ROM fs in RAM, size 1376256 bytes 78Setting up paging and the MMU. 79On node 0 totalpages: 2048 80zone(0): 2048 pages. 81zone(1): 0 pages. 82zone(2): 0 pages. 83Linux/CRIS port on ETRAX 100LX (c) 2001 Axis Communications AB 84Kernel command line: 85Calibrating delay loop... 19.91 BogoMIPS 86Memory: 13872k/16384k available (587k kernel code, 2512k reserved, 44k data, 24k init) 87kmem_create: Forcing size word alignment - vm_area_struct 88kmem_create: Forcing size word alignment - filp 89Dentry-cache hash table entries: 2048 (order: 1, 16384 bytes) 90Buffer-cache hash table entries: 2048 (order: 0, 8192 bytes) 91Page-cache hash table entries: 2048 (order: 0, 8192 bytes) 92kmem_create: Forcing size word alignment - kiobuf 93kmem_create: Forcing size word alignment - bdev_cache 94Inode-cache hash table entries: 1024 (order: 0, 8192 bytes) 95kmem_create: Forcing size word alignment - inode_cache 96POSIX conformance testing by UNIFIX 97Linux NET4.0 for Linux 2.4 98Based upon Swansea University Computer Society NET3.039 99Starting kswapd v1.8 100kmem_create: Forcing size word alignment - file lock cache 101kmem_create: Forcing size word alignment - blkdev_requests 102block: queued sectors max/low 9109kB/3036kB, 64 slots per queue 103ETRAX 100LX 10/100MBit ethernet v2.0 (c) 2000 Axis Communications AB 104eth0 initialized 105eth0: changed MAC to 00:40:8C:CD:00:00 106ETRAX 100LX serial-driver $Revision: 1.7 $, (c) 2000 Axis Communications AB 107ttyS0 at 0xb0000060 is a builtin UART with DMA 108ttyS1 at 0xb0000068 is a builtin UART with DMA 109ttyS2 at 0xb0000070 is a builtin UART with DMA 110ttyS3 at 0xb0000078 is a builtin UART with DMA 111Axis flash mapping: 200000 at 50000000 112Axis flash: Found 1 x16 CFI device at 0x0 in 16 bit mode 113 Amd/Fujitsu Extended Query Table v1.0 at 0x0040 114Axis flash: JEDEC Device ID is 0xC4. Assuming broken CFI table. 115Axis flash: Swapping erase regions for broken CFI table. 116number of CFI chips: 1 117 Using default partition table 118I2C driver v2.2, (c) 1999-2001 Axis Communications AB 119ETRAX 100LX GPIO driver v2.1, (c) 2001 Axis Communications AB 120NET4: Linux TCP/IP 1.0 for NET4.0 121IP Protocols: ICMP, UDP, TCP 122kmem_create: Forcing size word alignment - ip_dst_cache 123IP: routing cache hash table of 1024 buckets, 8Kbytes 124TCP: Hash tables configured (established 2048 bind 2048) 125NET4: Unix domain sockets 1.0/SMP for Linux NET4.0. 126VFS: Mounted root (cramfs filesystem) readonly. 127Init starts up... 128Mounted none on /proc ok. 129Setting up eth0 with ip 10.13.9.116 and mac 00:40:8c:18:04:60 130eth0: changed MAC to 00:40:8C:18:04:60 131Setting up lo with ip 127.0.0.1 132Default gateway is 10.13.9.1 133Hostname is bbox1 134Telnetd starting, using port 23. 135 using /bin/sash as shell. 136sftpd[15]: sftpd $Revision: 1.7 $ starting up 137 138 139 140And here is how some /proc entries look: 141 14217# cd /proc 14317# cat cpuinfo 144cpu : CRIS 145cpu revision : 10 146cpu model : ETRAX 100LX 147cache size : 8 kB 148fpu : no 149mmu : yes 150ethernet : 10/100 Mbps 151token ring : no 152scsi : yes 153ata : yes 154usb : yes 155bogomips : 99.84 156 15717# cat meminfo 158 total: used: free: shared: buffers: cached: 159Mem: 7028736 925696 6103040 114688 0 229376 160Swap: 0 0 0 161MemTotal: 6864 kB 162MemFree: 5960 kB 163MemShared: 112 kB 164Buffers: 0 kB 165Cached: 224 kB 166Active: 224 kB 167Inact_dirty: 0 kB 168Inact_clean: 0 kB 169Inact_target: 0 kB 170HighTotal: 0 kB 171HighFree: 0 kB 172LowTotal: 6864 kB 173LowFree: 5960 kB 174SwapTotal: 0 kB 175SwapFree: 0 kB 17617# ls -l /bin 177-rwxr-xr-x 1 342 100 10356 Jan 01 00:00 ifconfig 178-rwxr-xr-x 1 342 100 17548 Jan 01 00:00 init 179-rwxr-xr-x 1 342 100 9488 Jan 01 00:00 route 180-rwxr-xr-x 1 342 100 46036 Jan 01 00:00 sftpd 181-rwxr-xr-x 1 342 100 48104 Jan 01 00:00 sh 182-rwxr-xr-x 1 342 100 16252 Jan 01 00:00 telnetd 183 184 185(All programs are statically linked to the libc at this point - we have not ported the 186 shared libraries yet) 187 188 189 190 191 192 193 194 195 196