fxr.watson.org: linux-2.4.22 sys/Documentation/cris/

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1 Linux 2.4 on the CRIS architecture 2 ================================== 3 $Id: README,v 1.7 2001/04/19 12:38:32 bjornw Exp $ 4 5 This is a port of Linux 2.4 to Axis Communications ETRAX 100LX embedded 6 network CPU. For more information about CRIS and ETRAX please see further 7 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/doc/software/devboard_lx/install-howto.html 15 16 <more specific information should come in this document later> 17 18 What is CRIS ? 19 -------------- 20 21 CRIS is an acronym for 'Code Reduced Instruction Set'. It is the CPU 22 architecture in Axis Communication AB's range of embedded network CPU's, 23 called 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 25 operating system. 26 27 The ETRAX 100LX chip 28 -------------------- 29 30 For reference, plase see the press-release: 31 32 http://www.axis.com/news/us/001101_etrax.htm 33 34 The ETRAX 100LX is a 100 MIPS processor with 8kB cache, MMU, and a very broad 35 range of built-in interfaces, all with modern scatter/gather DMA. 36 37 Memory interfaces: 38 39 * SRAM 40 * NOR-flash/ROM 41 * EDO or page-mode DRAM 42 * SDRAM 43 44 I/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 58 The previous version of the ETRAX, the ETRAX 100, sits in almost all of 59 Axis shipping thin-servers like the Axis 2100 web camera or the ETRAX 100 60 developer-board. It lacks an MMU so the Linux we run on that is a version 61 of uClinux (Linux 2.0 without MM-support) ported to the CRIS architecture. 62 The new Linux 2.4 port has full MM and needs a CPU with an MMU, so it will 63 not run on the ETRAX 100. 64 65 A version of the Axis developer-board with ETRAX 100LX (running Linux 66 2.4) is now available. For more information please see developer.axis.com. 67 68 69 Bootlog 70 ------- 71 72 Just as an example, this is the debug-output from a boot of Linux 2.4 on 73 a board with ETRAX 100LX. The displayed BogoMIPS value is 5 times too small :) 74 At the end you see some user-mode programs booting like telnet and ftp daemons. 75 76 Linux version 2.4.1 (bjornw@godzilla.axis.se) (gcc version 2.96 20000427 (experimental)) #207 Wed Feb 21 15:48:15 CET 2001 77 ROM fs in RAM, size 1376256 bytes 78 Setting up paging and the MMU. 79 On node 0 totalpages: 2048 80 zone(0): 2048 pages. 81 zone(1): 0 pages. 82 zone(2): 0 pages. 83 Linux/CRIS port on ETRAX 100LX (c) 2001 Axis Communications AB 84 Kernel command line: 85 Calibrating delay loop... 19.91 BogoMIPS 86 Memory: 13872k/16384k available (587k kernel code, 2512k reserved, 44k data, 24k init) 87 kmem_create: Forcing size word alignment - vm_area_struct 88 kmem_create: Forcing size word alignment - filp 89 Dentry-cache hash table entries: 2048 (order: 1, 16384 bytes) 90 Buffer-cache hash table entries: 2048 (order: 0, 8192 bytes) 91 Page-cache hash table entries: 2048 (order: 0, 8192 bytes) 92 kmem_create: Forcing size word alignment - kiobuf 93 kmem_create: Forcing size word alignment - bdev_cache 94 Inode-cache hash table entries: 1024 (order: 0, 8192 bytes) 95 kmem_create: Forcing size word alignment - inode_cache 96 POSIX conformance testing by UNIFIX 97 Linux NET4.0 for Linux 2.4 98 Based upon Swansea University Computer Society NET3.039 99 Starting kswapd v1.8 100 kmem_create: Forcing size word alignment - file lock cache 101 kmem_create: Forcing size word alignment - blkdev_requests 102 block: queued sectors max/low 9109kB/3036kB, 64 slots per queue 103 ETRAX 100LX 10/100MBit ethernet v2.0 (c) 2000 Axis Communications AB 104 eth0 initialized 105 eth0: changed MAC to 00:40:8C:CD:00:00 106 ETRAX 100LX serial-driver $Revision: 1.7 $, (c) 2000 Axis Communications AB 107 ttyS0 at 0xb0000060 is a builtin UART with DMA 108 ttyS1 at 0xb0000068 is a builtin UART with DMA 109 ttyS2 at 0xb0000070 is a builtin UART with DMA 110 ttyS3 at 0xb0000078 is a builtin UART with DMA 111 Axis flash mapping: 200000 at 50000000 112 Axis flash: Found 1 x16 CFI device at 0x0 in 16 bit mode 113 Amd/Fujitsu Extended Query Table v1.0 at 0x0040 114 Axis flash: JEDEC Device ID is 0xC4. Assuming broken CFI table. 115 Axis flash: Swapping erase regions for broken CFI table. 116 number of CFI chips: 1 117 Using default partition table 118 I2C driver v2.2, (c) 1999-2001 Axis Communications AB 119 ETRAX 100LX GPIO driver v2.1, (c) 2001 Axis Communications AB 120 NET4: Linux TCP/IP 1.0 for NET4.0 121 IP Protocols: ICMP, UDP, TCP 122 kmem_create: Forcing size word alignment - ip_dst_cache 123 IP: routing cache hash table of 1024 buckets, 8Kbytes 124 TCP: Hash tables configured (established 2048 bind 2048) 125 NET4: Unix domain sockets 1.0/SMP for Linux NET4.0. 126 VFS: Mounted root (cramfs filesystem) readonly. 127 Init starts up... 128 Mounted none on /proc ok. 129 Setting up eth0 with ip 10.13.9.116 and mac 00:40:8c:18:04:60 130 eth0: changed MAC to 00:40:8C:18:04:60 131 Setting up lo with ip 127.0.0.1 132 Default gateway is 10.13.9.1 133 Hostname is bbox1 134 Telnetd starting, using port 23. 135 using /bin/sash as shell. 136 sftpd[15]: sftpd $Revision: 1.7 $ starting up 137 138 139 140 And here is how some /proc entries look: 141 142 17# cd /proc 143 17# cat cpuinfo 144 cpu : CRIS 145 cpu revision : 10 146 cpu model : ETRAX 100LX 147 cache size : 8 kB 148 fpu : no 149 mmu : yes 150 ethernet : 10/100 Mbps 151 token ring : no 152 scsi : yes 153 ata : yes 154 usb : yes 155 bogomips : 99.84 156 157 17# cat meminfo 158 total: used: free: shared: buffers: cached: 159 Mem: 7028736 925696 6103040 114688 0 229376 160 Swap: 0 0 0 161 MemTotal: 6864 kB 162 MemFree: 5960 kB 163 MemShared: 112 kB 164 Buffers: 0 kB 165 Cached: 224 kB 166 Active: 224 kB 167 Inact_dirty: 0 kB 168 Inact_clean: 0 kB 169 Inact_target: 0 kB 170 HighTotal: 0 kB 171 HighFree: 0 kB 172 LowTotal: 6864 kB 173 LowFree: 5960 kB 174 SwapTotal: 0 kB 175 SwapFree: 0 kB 176 17# 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

FreeBSD/Linux Kernel Cross Reference sys/Documentation/cris/

FreeBSD/Linux Kernel Cross Reference
sys/Documentation/cris/