✎ Build and run Linux-3.0 [ZTEX Wiki]

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===== Build and run Linux-3.0 =====

[[http://buildroot.uclibc.org/|Buildroot]] is a set of Makefiles and patches that makes it easy to generate a complete embedded Linux system. Buildroot can generate any or all of a cross-compilation toolchain, a root filesystem, a kernel image and a bootloader image.
===== Download =====

* download [[http://www.strijar.ru/ztex/leon3-buildroot-2011.02.tar.gz|leon3-buildroot BSP]]
  * unpack it

===== Build =====

BSP already configured for SPARC with hardware MUL (V8) and FPU. The rootfs will be located in the initrd ramfs inside the kernel. For that would build all of this do:

make

This will build toolchain, rootfs image and linux kernel. Check that all is well possible for the new files in output/images: rootfs.initramfs and zImage

===== DSU image =====

For build DSU image change dir to board/leon3 and run:

./make_dsu

It creates a file output/images/image.dsu. Start grmon (**with -nb**):

grmon-eval -uart /dev/ttyUSB0 -baud 460800 -nb

Load and run image:

grlib> load image.dsu
  section: .stage2 at 0x40000000, size 10240 bytes
  section: .vmlinux at 0x40004000, size 3582524 bytes
  total size: 3592764 bytes (329.2 kbit/s)
  read 10539 symbols
  entry point: 0x40000000
  grlib> run

Serial console with baud rate **38400** out is:

PROMLIB: Sun Boot Prom Version 0 Revision 0
  Linux version 3.0.0 (master@linux-xynp) (gcc version 4.4.5 (Buildroot 2011.02) ) #2 Fri Jul 29 22:43:40 MSD 2011
  bootconsole [earlyprom0] enabled
  ARCH: LEON
  TYPE: Leon3 System-on-a-Chip
  Ethernet address: 00:00:7c:cc:01:45
  CACHE: direct mapped cache, set size 4k
  CACHE: not flushing on every context switch
  Boot time fixup v1.6. 4/Mar/98 Jakub Jelinek (jj@ultra.linux.cz). Patching kernel for srmmu[LEON]/iommu
  OF stdout device is: /a::a
  PROM: Built device tree with 9379 bytes of memory.
  Booting Linux...
  Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 15355
  Kernel command line: console=ttyS0,38400 rootfs=/dev/ram0 init=/sbin/init 
  PID hash table entries: 256 (order: -2, 1024 bytes)
  Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
  Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
  Memory: 59116k/65536k available (2108k kernel code, 6420k reserved, 536k data, 840k init, 0k highmem)
  NR_IRQS:64
  Console: colour dummy device 80x25
  console [ttyS0] enabled, bootconsole disabled
  console [ttyS0] enabled, bootconsole disabled
  Calibrating delay loop... 72.90 BogoMIPS (lpj=364544)
  pid_max: default: 32768 minimum: 301
  Mount-cache hash table entries: 512
  NET: Registered protocol family 16
  bio: create slab <bio-0> at 0
  NET: Registered protocol family 2
  IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
  TCP established hash table entries: 2048 (order: 2, 16384 bytes)
  TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
  TCP: Hash tables configured (established 2048 bind 2048)
  TCP reno registered
  UDP hash table entries: 256 (order: 0, 4096 bytes)
  UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
  NET: Registered protocol family 1
  ROMFS MTD (C) 2007 Red Hat, Inc.
  msgmni has been set to 115
  io scheduler noop registered
  io scheduler deadline registered
  io scheduler cfq registered (default)
  Serial: GRLIB APBUART driver
  80000001: ttyS0 at MMIO 0x80000100 (irq = 2) is a GRLIB/APBUART
  grlib-apbuart at 0x80000100, irq 2
  brd: module loaded
  loop: module loaded
  TCP cubic registered
  NET: Registered protocol family 17
  Registering the dns_resolver key type
  leon: power management initialized
  drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
  Freeing unused kernel memory: 840k freed
  Initializing random number generator... done.
  
  Welcome to Buildroot
  buildroot login:

Login "root" without password.

===== Tests =====

You can try dhrystone test:

# dhrystone 
  
  Dhrystone Benchmark, Version 2.1 (Language: C)
  
  Program compiled without 'register' attribute
  
  Please give the number of runs through the benchmark: 400000
  
  Execution starts, 400000 runs through Dhrystone
  Execution ends
  
  Final values of the variables used in the benchmark:
  
  Int_Glob:            5
          should be:   5
  Bool_Glob:           1
          should be:   1
  Ch_1_Glob:           A
          should be:   A
  Ch_2_Glob:           B
          should be:   B
  Arr_1_Glob[8]:       7
          should be:   7
  Arr_2_Glob[8][7]:    400010
          should be:   Number_Of_Runs + 10
  Ptr_Glob->
    Ptr_Comp:          151560
          should be:   (implementation-dependent)
    Discr:             0
          should be:   0
    Enum_Comp:         2
          should be:   2
    Int_Comp:          17
          should be:   17
    Str_Comp:          DHRYSTONE PROGRAM, SOME STRING
          should be:   DHRYSTONE PROGRAM, SOME STRING
  Next_Ptr_Glob->
    Ptr_Comp:          151560
          should be:   (implementation-dependent), same as above
    Discr:             0
          should be:   0
    Enum_Comp:         1
          should be:   1
    Int_Comp:          18
          should be:   18
    Str_Comp:          DHRYSTONE PROGRAM, SOME STRING
          should be:   DHRYSTONE PROGRAM, SOME STRING
  Int_1_Loc:           5
          should be:   5
  Int_2_Loc:           13
          should be:   13
  Int_3_Loc:           7
          should be:   7
  Enum_Loc:            1
          should be:   1
  Str_1_Loc:           DHRYSTONE PROGRAM, 1'ST STRING
          should be:   DHRYSTONE PROGRAM, 1'ST STRING
  Str_2_Loc:           DHRYSTONE PROGRAM, 2'ND STRING
          should be:   DHRYSTONE PROGRAM, 2'ND STRING
  
  Microseconds for one run through Dhrystone:   16.5 
  Dhrystones per Second:                      60514.4

Or [[http://www.lua.org|Lua language]] interpreter:

# lua
  Lua 5.1.4  Copyright (C) 1994-2008 Lua.org, PUC-Rio
  > print(2+2)
  4
  >

===== Customizing =====

That would adjust the toolchain or rootfs package selection do:

make menuconfig

For customize [[http://www.busybox.net/|busybox]] do:

make busybox-menuconfig

And for tuning linux kernel do:

make linux-menuconfig

After that everything must be rebuilt:

make

And do not forget rebuild the DSU image

===== Prebuild image =====

* Linux [[http://www.strijar.ru/ztex/linux_image_dsu.zip|DSU image]]
  * Linux with SMP support [[http://www.strijar.ru/ztex/linux_smp_image_dsu.zip|DSU image]]

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