faq.html

ADI 公司blackfin系列的用户使用文挡。

<p>
The current default is to only allow two telnet connections into the Blackfin at a given time.  To allow more telnet sessions for the Blackfin, you will need to modify the <code>./uClinux-dist/vendors/AnalogDevices/BFXXX-XXXXX/device_table.txt</code> file.  The last number on the line for /dev/ttyp and /dev/ptyp control the number of telnet sessions available.  In this case, up to 8 telnet sessions are allowed.
</p>
<pre class="code">
/dev/ttyp	c	666	0	0	3	0	0	1	8
/dev/ptyp	c	666	0	0	2	0	0	1	8
</pre>

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<h2><a name="u-boot_takes_forever_to_write_to_flash" id="u-boot_takes_forever_to_write_to_flash">U-Boot takes forever to write to flash!</a></h2>
<div class="level2">

<p>
There was a bug in the flash driver in older versions of U-Boot (and thus the version found on many shipped boards) that caused flash operations to take an inordinate amount of time, even with quite small files. If you install the <a href="http://blackfin.uclinux.org/frs/?group_id=20" class="urlextern" title="http://blackfin.uclinux.org/frs/?group_id=20"  rel="nofollow">latest release</a> of U-Boot, the amount of time required to write to flash should return to normal.
</p>

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<h2><a name="i_get_bfin-uclinux-mkimagecommand_not_found_errors" id="i_get_bfin-uclinux-mkimagecommand_not_found_errors">I get &quot;bfin-uclinux-mkimage: command not found&quot; errors</a></h2>
<div class="level2">

<p>
The 2005R3 release of the toolchain omitted this program.  You should upgrade to the latest release where this issue has been rectified.
</p>

<p>
If you are building the toolchain yourself using the <a href="toolchain_build_script.html" class="wikilink1" title="toolchain_build_script.html">BuildToolChain script</a>, you need to specify the uboot source code using the -u option, otherwise the additional tools (such as mkimage) will be omitted.
</p>

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<h2><a name="what_does_a_normal_boot_look_like" id="what_does_a_normal_boot_look_like">What does a normal Boot Look like?</a></h2>
<div class="level2">

<p>
Booting on a BF533-STAMP, with a recent (R4) image, with a ram rootfs looks something like:
</p>
<pre class="code">
stamp&gt;bootm
## Booting image at 01000000 ...
   Image Name:   uClinux Kernel and Filesystem
   Created:      2006-03-23   5:48:47 UTC
   Image Type:   Blackfin Linux Kernel Image (gzip compressed)
   Data Size:    2829207 Bytes =  2.7 MB
   Load Address: 00001000
   Entry Point:  00001000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
Starting Kernel at = 1000
Linux version 2.6.12.1-BFIN-2005R4 (rgetz@home) (gcc version 3.4.4 (Blackfin 05R
Blackfin support (C) 2004 Analog Devices, Inc.
ADSP-BF533 Rev. 0.3
uClinux/BF533
Blackfin uClinux support by blackfin.uclinux.org
Processor Speed: 398 MHz core clock and 79 Mhz System Clock
Board Memory: 128MB
Memory map:
  text = 0x001000-0x0d9d58
  data = 0x0e6838-0x112fec
  bss  = 0x112ff0-0x1204b4
  rootfs = 0x7700000-0x7f00000
  stack = 0x0e8000-0x0ea000
Command line: 'root=/dev/mtdblock0 rw'
Instruction Cache Enabled
Data Cache Enabled (write-through)
Hardware Trace Enabled
Built 1 zonelists
Kernel command line: root=/dev/mtdblock0 rw
Configuring Blackfin Priority Driven Interrupts
PID hash table entries: 256 (order: 8, 4096 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Physical pages: 3c00
Memory available: 59648k/130149k RAM, (49k init code, 867k kernel code, 231k dat
Blackfin Scratchpad data SRAM: 4 KB
Blackfin DATA_A SRAM: 16 KB
Blackfin DATA_B SRAM: 16 KB
Security Framework v1.0.0 initialized
Capability LSM initialized
Mount-cache hash table entries: 512
NET: Registered protocol family 16
Blackfin DMA Controller for BF533
stamp_init(): registering device resources
Real Time Clock Driver v1.10e
blackfin_dpmc_init
Dynamic Power Management Controller: major=10, minor = 254
DPMC Driver v0.1
BlackFin BF533 serial driver version 2.00 With DMA Support
io scheduler noop registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre &lt;[e-mail]&gt;
Blackfin SMC91x interrupt setup: flag PF7, irq 27
eth0: SMC91C11xFD (rev 1) at 20300300 IRQ 27 [nowait]
eth0: Ethernet addr: 00:e0:22:fe:07:91
uclinux[mtd]: RAM probe address=0x7700000 size=0x800000
Creating 1 MTD partitions on &quot;RAM&quot;:
0x00000000-0x00800000 : &quot;EXT2fs&quot;
uclinux[mtd0]: set EXT2fs to be root filesystem
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
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)
NET: Registered protocol family 1
NET: Registered protocol family 17
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 48k freed (0xda000 - 0xe5000)
ttyS0 at irq = 21 is a builtin BlackFin UART
bfin_change_speed: baud = 57600, cval = 0x13

Welcome to:
       ____ _  _
      /  __| ||_|             _  _
 _   _| |  | | _ ____  _   _ \ \/ /
| | | | |  | || |  _ \| | | | \  /
| |_| | |__| || | | | | |_| | /  \
|  ___\____|_||_|_| |_|\____|/_/\_\
|_|

For further information see:
http://www.uclinux.org/
http://blackfin.uclinux.org/



BusyBox v1.00 (2006.02.17-14:21+0000) Built-in shell (msh)
Enter 'help' for a list of built-in commands.

root:~&gt; 
</pre>

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<h2><a name="i_want_to_learn_more_about_linux_development._can_you_recommend_a_good_resource" id="i_want_to_learn_more_about_linux_development._can_you_recommend_a_good_resource">I want to learn more about Linux development.  Can you recommend a good resource?</a></h2>
<div class="level2">

<p>
There are many good resources at <a href="references_and_pointers.html#good_books" class="wikilink1" title="references_and_pointers.html">the references and pointers section</a>
</p>

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<h2><a name="how_do_i_port_applications_to_blackfin_uclinux" id="how_do_i_port_applications_to_blackfin_uclinux">How do I port applications to Blackfin/uClinux</a></h2>
<div class="level2">

<p>
 <a href="porting_visual_dsp_program_to_uclinux.html" class="wikilink1" title="porting_visual_dsp_program_to_uclinux.html">porting_visual_dsp_program_to_uclinux</a>.
</p>

<p>
Also <a href="http://www.rowetel.com/blog/?p=3" class="urlextern" title="http://www.rowetel.com/blog/?p=3"  rel="nofollow">This</a> page describes some of the problems and solutions for porting large multi-threaded applications to uClinux.
</p>

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<h2><a name="more_questions_about_u-boot" id="more_questions_about_u-boot">More questions about u-boot?</a></h2>
<div class="level2">

<p>
<a href="uboot_trouble_shooting.html" class="wikilink1" title="uboot_trouble_shooting.html">uboot_trouble_shooting</a>
</p>

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<h2><a name="how_to_config_user_login_on_blackfin" id="how_to_config_user_login_on_blackfin">How to config user login on blackfin?</a></h2>
<div class="level2">
<ol>
<li class="level1"><div class="li"> In blackfin uclinux enviroment, use passwd to modify root passwd. and copy the generated etc/passwd file to your uclinux-dist/vendor/analogdevice/BF53?-STAMP/passwd, so you know what the root passwd is. You can also add other user names in this file.</div>
</li>
<li class="level1"><div class="li"> modify uclinux-dist/vendor/analogdevice/BF53?-STAMP/inittab, add one line: <pre class="code">ttyS0::respawn:/bin/getty -L ttyS0 57600 vt100</pre>
</div>
</li>
<li class="level1"><div class="li"> Unselect [Customize Vendor/User Settings] &ndash;&gt; [Core Applications] &ndash;&gt; [enable console shell]. Remove any binary and object files in folder uClinux-dist/user/init/.<pre class="code">~/your-uClinux-dist/&gt; cd user/init
~/your-uClinux-dist/user/init/&gt; make clean</pre>
</div>
</li>
<li class="level1"><div class="li"> Select Customize Vendor/User Settings] &ndash;&gt; [tinylogin] &rarr; (login,getty,passwd,su etc.). Build kernel. <pre class="code"> ~/your-uClinux-dist/&gt; make
~/your-uClinux-dist/&gt; cd romfs/bin
~/your-uClinux-dist/romfs/bin/&gt; ln -s tinylogin getty
~/your-uClinux-dist/romfs/bin/&gt; ln -s tinylogin login
~/your-uClinux-dist/romfs/bin/&gt; ln -s tinylogin passwd
~/your-uClinux-dist/romfs/bin/&gt; cd ../../
~/your-uClinux-dist/&gt; make image</pre>
</div>
</li>
</ol>

<p>
&rsquo; 
</p>

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