在VDSP中编译uclinux（7）：令人困惑的成功

哈哈，uClinux-2.6.x终于在VDSP下跑起来了，除了高兴还是高兴！经过整整两个星期的挑灯夜战，总算可以舒舒服服地睡上一觉了，庆祝一下：

Linux version 2.6.19.3-ADI-2007R1.1-svn (wmz@gtw.com) (vdsp 4.5) #2 Tue Sep 25 11:24:43 CST 2007
Warning: limiting memory to 53MB due to hardware anomaly 05000263
Blackfin support (C) 2004-2007 Analog Devices, Inc.
Compiled for ADSP-BF561 Rev 0.3
Blackfin Linux support by http://blackfin.uclinux.org/
Processor Speed: 594 MHz core clock and 99 Mhz System Clock
Board Memory: 64MB
Kernel Managed Memory: 64MB
Memory map:
  text      = 0x00010000-0x00138843
  init      = 0x00138843-0x001a29a2
  data      = 0x001aa138-0x001aecbc
  stack     = 0x001ac000-0x001ae000
  bss       = 0x001aecbc-0x001aecbc
  available = 0x001aecbc-0x03500000
  rootfs    = 0x03500000-0x03f00000
  DMA Zone  = 0x03f00000-0x04000000
Instruction Cache Enabled
Data Cache Enabled
Hardware Trace Enabled
Built 1 zonelists.  Total pages: 13462
Kernel command line: root=/dev/mtdblock0 rw console=ttyBF0,57600
Configuring Blackfin Priority Driven Interrupts
PID hash table entries: 256 (order: 8, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Physical pages: 3500
Memory available: 51968k/63831k RAM, (424k init code, 1186k kernel code, 0k data, 1024k dma)
Blackfin Scratchpad data SRAM: 4 KB
Blackfin DATA_A SRAM: 16 KB
Blackfin DATA_B SRAM: 16 KB
Blackfin Instruction SRAM: 16 KB
Mount-cache hash table entries: 512
Blackfin DMA Controller
ezkit_init(): registering device resources
Serial: Blackfin serial driver
bfin-uart.1: ttyBF0 at MMIO 0xffc00400 (irq = 35) is a BFIN-UART
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
io scheduler anticipatory registered (default)
io scheduler cfq registered
io scheduler noop registered
uclinux[mtd]: RAM probe address=0x3500000 size=0xa00000
Creating 1 MTD partitions on "RAM":
0x00000000-0x00a00000 : "ROMfs"
uclinux[mtd]: set ROMfs:EXT2  to be root filesystem
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 420k freed (0x139000 - 0x1a1000)
dma_alloc_init: dma_page @ 0x0019c000 - 256 pages at 0x03f00000
hostname: not found
/dev/null: cannot create
/dev/null: cannot create
ifconfig: not found
inetd: not found

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

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

 

BusyBox v1.4.1 (2007-09-25 15:34:28 CST) Built-in shell (msh)
Enter 'help' for a list of built-in commands.

root:~> pwd
/
root:~> ls
[1;34mbin[0m         [1;34mhome[0m        [1;34mmnt[0m         [0;0msample.wav[0m  [1;34mtmp[0m
[1;34mdev[0m         [1;34mlib[0m         [1;34mproc[0m        [1;36msbin[0m        [1;34musr[0m
[1;34metc[0m         [1;34mlost+found[0m  [1;34mroot[0m        [1;34msys[0m         [1;34mvar[0m
root:~> cd proc
root:/proc> ls
[1;34m1[0m            [1;34m6[0m            [0;0mdevices[0m      [0;0miomem[0m        [0;0mmeminfo[0m      [0;0mstat[0m
[1;34m2[0m            [1;34m7[0m            [0;0mdiskstats[0m    [0;0mioports[0m      [0;0mmodules[0m      [1;34msys[0m
[1;34m3[0m            [1;34m8[0m            [1;34mdriver[0m       [0;0mkallsyms[0m     [1;36mmounts[0m       [1;34mtty[0m
[1;34m38[0m           [0;0mbuddyinfo[0m    [0;0mexecdomains[0m  [0;0mkmsg[0m         [0;0mmtd[0m          [0;0muptime[0m
[1;34m4[0m            [1;34mbus[0m          [0;0mfilesystems[0m  [0;0mloadavg[0m      [1;34mnet[0m          [0;0mversion[0m
[1;34m41[0m           [0;0mcmdline[0m      [1;34mfs[0m           [0;0mlocks[0m        [0;0mpartitions[0m   [0;0mvmstat[0m
[1;34m5[0m            [0;0mcpuinfo[0m      [0;0minterrupts[0m   [0;0mmaps[0m         [1;36mself[0m         [0;0mzoneinfo[0m
root:/proc> cat dmesg
Linux version 2.6.19.3-ADI-2007R1.1-svn (wmz@gtw.com) (vdsp 4.5) #2 Tue Sep 25 11:24:43 CST 2007
Warning: limiting memory to 53MB due to hardware anomaly 05000263
Blackfin support (C) 2004-2007 Analog Devices, Inc.
Compiled for ADSP-BF561 Rev 0.3
Blackfin Linux support by http://blackfin.uclinux.org/
Processor Speed: 594 MHz core clock and 99 Mhz System Clock
Board Memory: 64MB
Kernel Managed Memory: 64MB
Memory map:
  text      = 0x00010000-0x00138843
  init      = 0x00138843-0x001a29a2
  data      = 0x001aa138-0x001aecbc
  stack     = 0x001ac000-0x001ae000
  bss       = 0x001aecbc-0x001aecbc
  available = 0x001aecbc-0x03500000
  rootfs    = 0x03500000-0x03f00000
  DMA Zone  = 0x03f00000-0x04000000
On node 0 totalpages: 13568
  DMA zone: 106 pages used for memmap
  DMA zone: 0 pages reserved
  DMA zone: 13462 pages, LIFO batch:3
  Normal zone: 0 pages used for memmap
Instruction Cache Enabled
Data Cache Enabled
Hardware Trace Enabled
Built 1 zonelists.  Total pages: 13462
Kernel command line: root=/dev/mtdblock0 rw console=ttyBF0,57600
Configuring Blackfin Priority Driven Interrupts
PID hash table entries: 256 (order: 8, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Physical pages: 3500
Memory available: 51968k/63831k RAM, (424k init code, 1186k kernel code, 0k data, 1024k dma)
Blackfin Scratchpad data SRAM: 4 KB
Blackfin DATA_A SRAM: 16 KB
Blackfin DATA_B SRAM: 16 KB
Blackfin Instruction SRAM: 16 KB
Calibrating delay loop... 1179.64 BogoMIPS (lpj=2359296)
Mount-cache hash table entries: 512
Blackfin DMA Controller
ezkit_init(): registering device resources
Serial: Blackfin serial driver
bfin-uart.1: ttyBF0 at MMIO 0xffc00400 (irq = 35) is a BFIN-UART
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
io scheduler anticipatory registered (default)
io scheduler cfq registered
io scheduler noop registered
uclinux[mtd]: RAM probe address=0x3500000 size=0xa00000
Creating 1 MTD partitions on "RAM":
0x00000000-0x00a00000 : "ROMfs"
uclinux[mtd]: set ROMfs:EXT2  to be root filesystem
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 420k freed (0x139000 - 0x1a1000)
dma_alloc_init: dma_page @ 0x0019c000 - 256 pages at 0x03f00000
root:/proc>

好可爱的uClinux标志，不是吗？

当然，还有一些令人困惑的问题。

1、在加载/root时的代码(init/do_mounts.c)

#ifdef CONFIG_BLOCK
 create_dev("/dev/root", ROOT_DEV);
 mount_block_root("/dev/root", root_mountflags);
#endif
当系统运行到这里时，在VFS中居然没有建立/dev和/root两个目录，从而造成文件系统无法加载，造成上篇文章中提到的panic。所以我在其中加了两行语句建立这两个目录就一切OK了！

#ifdef CONFIG_BLOCK
    sys_mkdir("/dev", 0700);
    sys_mkdir("/root", 0700);
 create_dev("/dev/root", ROOT_DEV);
 mount_block_root("/dev/root", root_mountflags);
#endif

2、在编译mm下的文件时，居然不能打开inline，否则将无法运行，原因还不清楚。

睡一觉先！ZZZ......