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+Linux on the CRIS architecture
+==============================
+
+This is a port of Linux to Axis Communications ETRAX 100LX,
+ETRAX FS and ARTPEC-3 embedded network CPUs.
+
+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/wiki/doku.php?id=axis:install-howto-2_20
+
+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 ETRAX 100LX chip
+--------------------
+
+For reference, please see the following link:
+
+http://www.axis.com/products/dev_etrax_100lx/index.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)
+
+ETRAX 100LX is CRISv10 architecture.
+
+
+The ETRAX FS and ARTPEC-3 chips
+-------------------------------
+
+The ETRAX FS is a 200MHz 32-bit RISC processor with on-chip 16kB
+I-cache and 16kB D-cache and with a wide range of device interfaces
+including multiple high speed serial ports and an integrated USB 1.1 PHY.
+
+The ARTPEC-3 is a variant of the ETRAX FS with additional IO-units
+used by the Axis Communications network cameras.
+
+See below link for more information:
+
+http://www.axis.com/products/dev_etrax_fs/index.htm
+
+ETRAX FS and ARTPEC-3 are both CRISv32 architectures.
+
+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
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