Compiling uClinux (7) in vdsp: confusing success

Haha, uClinux-2.6.x finally ran up under vdsp, in addition to happy or happy! After two weeks of night fights, you can finally comfortably sleep and celebrate:

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 53 MB 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: 64 MB
Kernel managed memory: 64 MB
Memory Map:
TEXT = 0x000-0x00138843
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
Refreshing ing 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: 51968 K/63831 k ram, (424 K init code, 1186 K kernel code, 0 K data, 1024 k 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 an BFIN-UART
Ramdisk driver initialized: 16 RAM disks of 4096 K 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: 420 K 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:
______
/__| | __
_ | _______////
| _/| //
| _ | |__ | _ | //
| ___/____ | _ |/____ | /_//_/
| _ |

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

 

Busybox v1.4.1 (15:34:28 Cst) built-in Shell (MSH)
Enter 'help' for a list of built-in commands.

Root: ~> PWD
/
Root: ~> Ls
[1; 34 mbin [0 m [1; 34 mhome [0 m [1; 34 mmnt [0 m %0%0msample.wav [0 m [1; 34 mtmp [0 m
[1; 34 mdev [0 m [1; 34 mlib [0 m [1; 34 mproc [0 m [1; 36 msbin [0 m [1; 34 musr [0 m
[1; 34 metc [0 m [1; 34 mlost + found [0 m [1; 34 mroot [0 m [1; 34 msys [0 m [1; 34 mvar [0 m
Root: ~> CD proc
Root:/proc> ls
[1; 34m1 [0 m [1; 34m6 [0 m [0; 0 mdevices [0 m [0; 0 miomem [0 m [0; 0 mmeminfo [0 m [0; 0 mstat [0 m
[1; 34m2 [0 m [1; 34m7 [0 m [0; 0 mdiskstats [0 m [0; 0 mioports [0 m [0; 0 mmodules [0 m [1; 34 msys [0 m
[1; 34m3 [0 m [1; 34m8 [0 m [1; 34 mdriver [0 m [0; 0 mkallsyms [0 m [1; 36 mmounts [0 m [1; 34 mtty [0 m
[1; 34m38 [0 m [0; 0 mbuddyinfo [0 m [0; 0 mexecdomains [0 m [0; 0 mkmsg [0 m [0; 0 mmtd [0 m [0; 0 muptime [0 m
[1; 34m4 [0 m [1; 34 mbus [0 m [0; 0 mfilesystems [0 m [0; 0 mloadavg [0 m [1; 34 Mnet [0 m [0; 0 mversion [0 m
[1; 34m41 [0 m [0; 0 mcmdline [0 m [1; 34mfs [0 m [0; 0 mlocks [0 m [0; 0 mpartitions [0 m [0; 0 mvmstat [0 m
[1; 34m5 [0 m [0; 0 mcpuinfo [0 m [0; 0 minterrupts [0 m [0; 0 mmaps [0 m [1; 36 mself [0 m [0; 0 mzoneinfo [0 m
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 53 MB 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: 64 MB
Kernel managed memory: 64 MB
Memory Map:
TEXT = 0x000-0x00138843
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 zones: 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
Refreshing ing 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: 51968 K/63831 k ram, (424 K init code, 1186 K kernel code, 0 K data, 1024 k 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 an BFIN-UART
Ramdisk driver initialized: 16 RAM disks of 4096 K 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: 420 K freed (0x139000-0x1a1000)
Dma_alloc_init: dma_page @ 0x0019c000-256 pages at 0x03f00000
Root:/proc>

The cute uClinux logo, isn't it?

Of course, there are some confusing questions.

1. Code for loading/root (init/do_mounts.c)

# Ifdef config_block
Create_dev ("/dev/root", root_dev );
Mount_block_root ("/dev/root", root_mountflags );
# Endif
When the system runs here, the/Dev and/root directories are not created in VFS, resulting in the file system being unable to load, resulting in the panic mentioned in the previous article. So I added two lines of statements in IT to create these two directories and everything is OK!

# 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. You cannot open inline when compiling a file under mm. Otherwise, the file cannot run because it is unclear.

Take a nap first! Zzz ......