Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/Documentation/cris/

Back Parent directory
File README 6394 bytes

  1 Linux on the CRIS architecture
  2 ==============================
  3 
  4 This is a port of Linux to Axis Communications ETRAX 100LX,
  5 ETRAX FS and ARTPEC-3 embedded network CPUs.
  6 
  7 For more information about CRIS and ETRAX please see further below.
  8 
  9 In order to compile this you need a version of gcc with support for the
 10 ETRAX chip family. Please see this link for more information on how to
 11 download the compiler and other tools useful when building and booting
 12 software for the ETRAX platform:
 13 
 14 http://developer.axis.com/wiki/doku.php?id=axis:install-howto-2_20
 15 
 16 What is CRIS ?
 17 --------------
 18 
 19 CRIS is an acronym for 'Code Reduced Instruction Set'. It is the CPU
 20 architecture in Axis Communication AB's range of embedded network CPU's,
 21 called ETRAX.
 22 
 23 The ETRAX 100LX chip
 24 --------------------
 25 
 26 For reference, please see the following link:
 27 
 28 http://www.axis.com/products/dev_etrax_100lx/index.htm
 29 
 30 The ETRAX 100LX is a 100 MIPS processor with 8kB cache, MMU, and a very broad
 31 range of built-in interfaces, all with modern scatter/gather DMA.
 32 
 33 Memory interfaces:
 34 
 35         * SRAM
 36         * NOR-flash/ROM
 37         * EDO or page-mode DRAM
 38         * SDRAM
 39 
 40 I/O interfaces:
 41 
 42         * one 10/100 Mbit/s ethernet controller
 43         * four serial-ports (up to 6 Mbit/s)
 44         * two synchronous serial-ports for multimedia codec's etc.
 45         * USB host controller and USB slave
 46         * ATA
 47         * SCSI
 48         * two parallel-ports
 49         * two generic 8-bit ports
 50 
 51         (not all interfaces are available at the same time due to chip pin
 52          multiplexing)
 53 
 54 ETRAX 100LX is CRISv10 architecture.
 55 
 56 
 57 The ETRAX FS and ARTPEC-3 chips
 58 -------------------------------
 59 
 60 The ETRAX FS is a 200MHz 32-bit RISC processor with on-chip 16kB
 61 I-cache and 16kB D-cache and with a wide range of device interfaces
 62 including multiple high speed serial ports and an integrated USB 1.1 PHY.
 63 
 64 The ARTPEC-3 is a variant of the ETRAX FS with additional IO-units
 65 used by the Axis Communications network cameras.
 66 
 67 See below link for more information:
 68 
 69 http://www.axis.com/products/dev_etrax_fs/index.htm
 70 
 71 ETRAX FS and ARTPEC-3 are both CRISv32 architectures.
 72 
 73 Bootlog
 74 -------
 75 
 76 Just as an example, this is the debug-output from a boot of Linux 2.4 on
 77 a board with ETRAX 100LX. The displayed BogoMIPS value is 5 times too small :)
 78 At the end you see some user-mode programs booting like telnet and ftp daemons.
 79 
 80 Linux version 2.4.1 (bjornw@godzilla.axis.se) (gcc version 2.96 20000427 (experimental)) #207 Wed Feb 21 15:48:15 CET 2001
 81 ROM fs in RAM, size 1376256 bytes
 82 Setting up paging and the MMU.
 83 On node 0 totalpages: 2048
 84 zone(0): 2048 pages.
 85 zone(1): 0 pages.
 86 zone(2): 0 pages.
 87 Linux/CRIS port on ETRAX 100LX (c) 2001 Axis Communications AB
 88 Kernel command line: 
 89 Calibrating delay loop... 19.91 BogoMIPS
 90 Memory: 13872k/16384k available (587k kernel code, 2512k reserved, 44k data, 24k init)
 91 kmem_create: Forcing size word alignment - vm_area_struct
 92 kmem_create: Forcing size word alignment - filp
 93 Dentry-cache hash table entries: 2048 (order: 1, 16384 bytes)
 94 Buffer-cache hash table entries: 2048 (order: 0, 8192 bytes)
 95 Page-cache hash table entries: 2048 (order: 0, 8192 bytes)
 96 kmem_create: Forcing size word alignment - kiobuf
 97 kmem_create: Forcing size word alignment - bdev_cache
 98 Inode-cache hash table entries: 1024 (order: 0, 8192 bytes)
 99 kmem_create: Forcing size word alignment - inode_cache
100 POSIX conformance testing by UNIFIX
101 Linux NET4.0 for Linux 2.4
102 Based upon Swansea University Computer Society NET3.039
103 Starting kswapd v1.8
104 kmem_create: Forcing size word alignment - file lock cache
105 kmem_create: Forcing size word alignment - blkdev_requests
106 block: queued sectors max/low 9109kB/3036kB, 64 slots per queue
107 ETRAX 100LX 10/100MBit ethernet v2.0 (c) 2000 Axis Communications AB
108 eth0 initialized
109 eth0: changed MAC to 00:40:8C:CD:00:00
110 ETRAX 100LX serial-driver $Revision: 1.7 $, (c) 2000 Axis Communications AB
111 ttyS0 at 0xb0000060 is a builtin UART with DMA
112 ttyS1 at 0xb0000068 is a builtin UART with DMA
113 ttyS2 at 0xb0000070 is a builtin UART with DMA
114 ttyS3 at 0xb0000078 is a builtin UART with DMA
115 Axis flash mapping: 200000 at 50000000
116 Axis flash: Found 1 x16 CFI device at 0x0 in 16 bit mode
117  Amd/Fujitsu Extended Query Table v1.0 at 0x0040
118 Axis flash: JEDEC Device ID is 0xC4. Assuming broken CFI table.
119 Axis flash: Swapping erase regions for broken CFI table.
120 number of CFI chips: 1
121  Using default partition table
122 I2C driver v2.2, (c) 1999-2001 Axis Communications AB
123 ETRAX 100LX GPIO driver v2.1, (c) 2001 Axis Communications AB
124 NET4: Linux TCP/IP 1.0 for NET4.0
125 IP Protocols: ICMP, UDP, TCP
126 kmem_create: Forcing size word alignment - ip_dst_cache
127 IP: routing cache hash table of 1024 buckets, 8Kbytes
128 TCP: Hash tables configured (established 2048 bind 2048)
129 NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
130 VFS: Mounted root (cramfs filesystem) readonly.
131 Init starts up...
132 Mounted none on /proc ok.
133 Setting up eth0 with ip 10.13.9.116 and mac 00:40:8c:18:04:60
134 eth0: changed MAC to 00:40:8C:18:04:60
135 Setting up lo with ip 127.0.0.1
136 Default gateway is 10.13.9.1
137 Hostname is bbox1
138 Telnetd starting, using port 23.
139   using /bin/sash as shell.
140 sftpd[15]: sftpd $Revision: 1.7 $ starting up
141 
142 
143 
144 And here is how some /proc entries look:
145 
146 17# cd /proc
147 17# cat cpuinfo
148 cpu             : CRIS
149 cpu revision    : 10
150 cpu model       : ETRAX 100LX
151 cache size      : 8 kB
152 fpu             : no
153 mmu             : yes
154 ethernet        : 10/100 Mbps
155 token ring      : no
156 scsi            : yes
157 ata             : yes
158 usb             : yes
159 bogomips        : 99.84
160 
161 17# cat meminfo
162         total:    used:    free:  shared: buffers:  cached:
163 Mem:   7028736   925696  6103040   114688        0   229376
164 Swap:        0        0        0
165 MemTotal:         6864 kB
166 MemFree:          5960 kB
167 MemShared:         112 kB
168 Buffers:             0 kB
169 Cached:            224 kB
170 Active:            224 kB
171 Inact_dirty:         0 kB
172 Inact_clean:         0 kB
173 Inact_target:        0 kB
174 HighTotal:           0 kB
175 HighFree:            0 kB
176 LowTotal:         6864 kB
177 LowFree:          5960 kB
178 SwapTotal:           0 kB
179 SwapFree:            0 kB
180 17# ls -l /bin
181 -rwxr-xr-x  1 342      100         10356  Jan 01 00:00 ifconfig
182 -rwxr-xr-x  1 342      100         17548  Jan 01 00:00 init
183 -rwxr-xr-x  1 342      100          9488  Jan 01 00:00 route
184 -rwxr-xr-x  1 342      100         46036  Jan 01 00:00 sftpd
185 -rwxr-xr-x  1 342      100         48104  Jan 01 00:00 sh
186 -rwxr-xr-x  1 342      100         16252  Jan 01 00:00 telnetd
187 
188 
189 
190 
191 
192 
193 
194 
195 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us