diff options
Diffstat (limited to 'Documentation/cris/README')
| -rw-r--r-- | Documentation/cris/README | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/Documentation/cris/README b/Documentation/cris/README new file mode 100644 index 000000000000..795a1dabe6c7 --- /dev/null +++ b/Documentation/cris/README @@ -0,0 +1,195 @@ +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) + + + + + + + + + |