2024-09-09 08:57:42 +00:00
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Linux on the CRIS architecture
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==============================
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2024-09-09 08:52:07 +00:00
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2024-09-09 08:57:42 +00:00
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This is a port of Linux to Axis Communications ETRAX 100LX,
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ETRAX FS and ARTPEC-3 embedded network CPUs.
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For more information about CRIS and ETRAX please see further below.
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In order to compile this you need a version of gcc with support for the
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ETRAX chip family. Please see this link for more information on how to
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download the compiler and other tools useful when building and booting
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software for the ETRAX platform:
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2024-09-09 08:57:42 +00:00
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http://developer.axis.com/wiki/doku.php?id=axis:install-howto-2_20
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What is CRIS ?
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--------------
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CRIS is an acronym for 'Code Reduced Instruction Set'. It is the CPU
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architecture in Axis Communication AB's range of embedded network CPU's,
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called ETRAX.
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The ETRAX 100LX chip
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--------------------
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2024-09-09 08:57:42 +00:00
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For reference, please see the following link:
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2024-09-09 08:57:42 +00:00
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http://www.axis.com/products/dev_etrax_100lx/index.htm
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2024-09-09 08:57:42 +00:00
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The ETRAX 100LX is a 100 MIPS processor with 8kB cache, MMU, and a very broad
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range of built-in interfaces, all with modern scatter/gather DMA.
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Memory interfaces:
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* SRAM
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* NOR-flash/ROM
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* EDO or page-mode DRAM
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* SDRAM
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I/O interfaces:
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* one 10/100 Mbit/s ethernet controller
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* four serial-ports (up to 6 Mbit/s)
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* two synchronous serial-ports for multimedia codec's etc.
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* USB host controller and USB slave
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* ATA
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* SCSI
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* two parallel-ports
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* two generic 8-bit ports
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(not all interfaces are available at the same time due to chip pin
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multiplexing)
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ETRAX 100LX is CRISv10 architecture.
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The ETRAX FS and ARTPEC-3 chips
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-------------------------------
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The ETRAX FS is a 200MHz 32-bit RISC processor with on-chip 16kB
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I-cache and 16kB D-cache and with a wide range of device interfaces
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including multiple high speed serial ports and an integrated USB 1.1 PHY.
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The ARTPEC-3 is a variant of the ETRAX FS with additional IO-units
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used by the Axis Communications network cameras.
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See below link for more information:
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http://www.axis.com/products/dev_etrax_fs/index.htm
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ETRAX FS and ARTPEC-3 are both CRISv32 architectures.
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Bootlog
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-------
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Just as an example, this is the debug-output from a boot of Linux 2.4 on
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a board with ETRAX 100LX. The displayed BogoMIPS value is 5 times too small :)
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At the end you see some user-mode programs booting like telnet and ftp daemons.
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Linux version 2.4.1 (bjornw@godzilla.axis.se) (gcc version 2.96 20000427 (experimental)) #207 Wed Feb 21 15:48:15 CET 2001
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ROM fs in RAM, size 1376256 bytes
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Setting up paging and the MMU.
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On node 0 totalpages: 2048
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zone(0): 2048 pages.
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zone(1): 0 pages.
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zone(2): 0 pages.
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Linux/CRIS port on ETRAX 100LX (c) 2001 Axis Communications AB
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Kernel command line:
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Calibrating delay loop... 19.91 BogoMIPS
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Memory: 13872k/16384k available (587k kernel code, 2512k reserved, 44k data, 24k init)
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kmem_create: Forcing size word alignment - vm_area_struct
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kmem_create: Forcing size word alignment - filp
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Dentry-cache hash table entries: 2048 (order: 1, 16384 bytes)
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Buffer-cache hash table entries: 2048 (order: 0, 8192 bytes)
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Page-cache hash table entries: 2048 (order: 0, 8192 bytes)
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kmem_create: Forcing size word alignment - kiobuf
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kmem_create: Forcing size word alignment - bdev_cache
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Inode-cache hash table entries: 1024 (order: 0, 8192 bytes)
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kmem_create: Forcing size word alignment - inode_cache
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POSIX conformance testing by UNIFIX
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Linux NET4.0 for Linux 2.4
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Based upon Swansea University Computer Society NET3.039
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Starting kswapd v1.8
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kmem_create: Forcing size word alignment - file lock cache
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kmem_create: Forcing size word alignment - blkdev_requests
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block: queued sectors max/low 9109kB/3036kB, 64 slots per queue
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ETRAX 100LX 10/100MBit ethernet v2.0 (c) 2000 Axis Communications AB
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eth0 initialized
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eth0: changed MAC to 00:40:8C:CD:00:00
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ETRAX 100LX serial-driver $Revision: 1.7 $, (c) 2000 Axis Communications AB
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ttyS0 at 0xb0000060 is a builtin UART with DMA
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ttyS1 at 0xb0000068 is a builtin UART with DMA
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ttyS2 at 0xb0000070 is a builtin UART with DMA
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ttyS3 at 0xb0000078 is a builtin UART with DMA
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Axis flash mapping: 200000 at 50000000
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Axis flash: Found 1 x16 CFI device at 0x0 in 16 bit mode
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Amd/Fujitsu Extended Query Table v1.0 at 0x0040
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Axis flash: JEDEC Device ID is 0xC4. Assuming broken CFI table.
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Axis flash: Swapping erase regions for broken CFI table.
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number of CFI chips: 1
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Using default partition table
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I2C driver v2.2, (c) 1999-2001 Axis Communications AB
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ETRAX 100LX GPIO driver v2.1, (c) 2001 Axis Communications AB
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NET4: Linux TCP/IP 1.0 for NET4.0
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IP Protocols: ICMP, UDP, TCP
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kmem_create: Forcing size word alignment - ip_dst_cache
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IP: routing cache hash table of 1024 buckets, 8Kbytes
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TCP: Hash tables configured (established 2048 bind 2048)
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NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
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VFS: Mounted root (cramfs filesystem) readonly.
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Init starts up...
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Mounted none on /proc ok.
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Setting up eth0 with ip 10.13.9.116 and mac 00:40:8c:18:04:60
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eth0: changed MAC to 00:40:8C:18:04:60
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Setting up lo with ip 127.0.0.1
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Default gateway is 10.13.9.1
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Hostname is bbox1
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Telnetd starting, using port 23.
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using /bin/sash as shell.
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sftpd[15]: sftpd $Revision: 1.7 $ starting up
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And here is how some /proc entries look:
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17# cd /proc
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17# cat cpuinfo
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cpu : CRIS
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cpu revision : 10
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cpu model : ETRAX 100LX
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cache size : 8 kB
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fpu : no
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mmu : yes
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ethernet : 10/100 Mbps
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token ring : no
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scsi : yes
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ata : yes
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usb : yes
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bogomips : 99.84
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17# cat meminfo
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total: used: free: shared: buffers: cached:
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Mem: 7028736 925696 6103040 114688 0 229376
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Swap: 0 0 0
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MemTotal: 6864 kB
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MemFree: 5960 kB
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MemShared: 112 kB
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Buffers: 0 kB
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Cached: 224 kB
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Active: 224 kB
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Inact_dirty: 0 kB
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Inact_clean: 0 kB
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Inact_target: 0 kB
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HighTotal: 0 kB
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HighFree: 0 kB
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LowTotal: 6864 kB
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LowFree: 5960 kB
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SwapTotal: 0 kB
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SwapFree: 0 kB
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17# ls -l /bin
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-rwxr-xr-x 1 342 100 10356 Jan 01 00:00 ifconfig
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-rwxr-xr-x 1 342 100 17548 Jan 01 00:00 init
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-rwxr-xr-x 1 342 100 9488 Jan 01 00:00 route
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-rwxr-xr-x 1 342 100 46036 Jan 01 00:00 sftpd
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-rwxr-xr-x 1 342 100 48104 Jan 01 00:00 sh
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-rwxr-xr-x 1 342 100 16252 Jan 01 00:00 telnetd
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