1============== 2OpenRISC Linux 3============== 4 5This is a port of Linux to the OpenRISC class of microprocessors; the initial 6target architecture, specifically, is the 32-bit OpenRISC 1000 family (or1k). 7 8For information about OpenRISC processors and ongoing development: 9 10 ======= ============================= 11 website https://openrisc.io 12 email openrisc@lists.librecores.org 13 ======= ============================= 14 15--------------------------------------------------------------------- 16 17Build instructions for OpenRISC toolchain and Linux 18=================================================== 19 20In order to build and run Linux for OpenRISC, you'll need at least a basic 21toolchain and, perhaps, the architectural simulator. Steps to get these bits 22in place are outlined here. 23 241) Toolchain 25 26Toolchain binaries can be obtained from openrisc.io or our github releases page. 27Instructions for building the different toolchains can be found on openrisc.io 28or Stafford's toolchain build and release scripts. 29 30 ========== ================================================= 31 binaries https://github.com/openrisc/or1k-gcc/releases 32 toolchains https://openrisc.io/software 33 building https://github.com/stffrdhrn/or1k-toolchain-build 34 ========== ================================================= 35 362) Building 37 38Build the Linux kernel as usual:: 39 40 make ARCH=openrisc CROSS_COMPILE="or1k-linux-" defconfig 41 make ARCH=openrisc CROSS_COMPILE="or1k-linux-" 42 433) Running on FPGA (optional) 44 45The OpenRISC community typically uses FuseSoC to manage building and programming 46an SoC into an FPGA. The below is an example of programming a De0 Nano 47development board with the OpenRISC SoC. During the build FPGA RTL is code 48downloaded from the FuseSoC IP cores repository and built using the FPGA vendor 49tools. Binaries are loaded onto the board with openocd. 50 51:: 52 53 git clone https://github.com/olofk/fusesoc 54 cd fusesoc 55 sudo pip install -e . 56 57 fusesoc init 58 fusesoc build de0_nano 59 fusesoc pgm de0_nano 60 61 openocd -f interface/altera-usb-blaster.cfg \ 62 -f board/or1k_generic.cfg 63 64 telnet localhost 4444 65 > init 66 > halt; load_image vmlinux ; reset 67 684) Running on a Simulator (optional) 69 70QEMU is a processor emulator which we recommend for simulating the OpenRISC 71platform. Please follow the OpenRISC instructions on the QEMU website to get 72Linux running on QEMU. You can build QEMU yourself, but your Linux distribution 73likely provides binary packages to support OpenRISC. 74 75 ============= ====================================================== 76 qemu openrisc https://wiki.qemu.org/Documentation/Platforms/OpenRISC 77 ============= ====================================================== 78 79--------------------------------------------------------------------- 80 81Terminology 82=========== 83 84In the code, the following particles are used on symbols to limit the scope 85to more or less specific processor implementations: 86 87========= ======================================= 88openrisc: the OpenRISC class of processors 89or1k: the OpenRISC 1000 family of processors 90or1200: the OpenRISC 1200 processor 91========= ======================================= 92 93--------------------------------------------------------------------- 94 95History 96======== 97 9818-11-2003 Matjaz Breskvar (phoenix@bsemi.com) 99 initial port of linux to OpenRISC/or32 architecture. 100 all the core stuff is implemented and seams usable. 101 10208-12-2003 Matjaz Breskvar (phoenix@bsemi.com) 103 complete change of TLB miss handling. 104 rewrite of exceptions handling. 105 fully functional sash-3.6 in default initrd. 106 a much improved version with changes all around. 107 10810-04-2004 Matjaz Breskvar (phoenix@bsemi.com) 109 alot of bugfixes all over. 110 ethernet support, functional http and telnet servers. 111 running many standard linux apps. 112 11326-06-2004 Matjaz Breskvar (phoenix@bsemi.com) 114 port to 2.6.x 115 11630-11-2004 Matjaz Breskvar (phoenix@bsemi.com) 117 lots of bugfixes and enhancments. 118 added opencores framebuffer driver. 119 12009-10-2010 Jonas Bonn (jonas@southpole.se) 121 major rewrite to bring up to par with upstream Linux 2.6.36 122