Some time ago, I was prepared to allow U-boot to support NAND flash, but it was ultimately fruitless. So I decided to put it first, let uClinux run first, and give myself some confidence. After reading some articles on the internet, I finally saw a cute prompt! Current configuration: CPU is bf561, software is uClinux-dist-2007R1.1-RC3, U-boot has been written to nor flash and can be started properly. 1. Unzip the uClinux-dist-2007R1.1-RC3 and use the default configuration of make menuconfig to generate an available image. Finally, the uimage. ext2 generated in the images directory has 3 MB. This is an image with a file header, which is also equivalent to the uimage mentioned in U-boot readme. 2. Because my board does not have the network function, I can only download it from the serial port using loadb, but it takes more than 20 minutes (57600) to download it at a time. This is a test of patience. Fortunately, the simulator directly writes the image to the position 0x0300 0000 (memory-> Fill) in the vdsp ). 3. Turn off the vdsp and start U-boot after reset. Use iminfo 0x0300 0000 to see the following information: gtw> iminfo 3000000 # Checking image at 03000000... image name: uClinux kernel and ext2 image type: Blackfin Linux kernel image (gzip compressed) data size: 3000041 bytes = 2.9 MB load address: 00001000 entry point: 00001000 verifying checksum... ok4. Use MD 0x0300 0000 to view the following information: gtw> MD 300000003000000: 56190527 e820c44f fa81f846 e9c62d00 '.. vo .. f.... -.. 03000010: 00100000 00100000 a9fdeb65 01021005 ........ E ....... 03000020: 696c4375 2078756e 6e000054b 61206c65 uClinux kernel a03000030: 6520646e 00327478 00000000 00000000 nd ext2 ......... this is the file header of the image. The 64 bytes correspond to the following data structure: # define ih_magic 0x27051956/* Image Magic Number */# define ih_nmlen 32/* image name length * // ** all data in network byte order (aka natural aka bigendian) */typedef struc T image_header {uint32_t ih_magic;/* image header magic number */uint32_t ih_hcrc;/* image header CRC checksum */uint32_t ih_time;/* image creation timestamp */uint32_t ih_size; /* image data size */uint32_t ih_load;/* data load address */uint32_t ih_ep;/* entry point address */uint32_t ih_dcrc; /* image data CRC checksum */uint8_t ih_ OS;/* Operating System */uint8_t ih_arch;/* CPU Architecture */uint8_t ih_type;/* image type */uint8_t ih_comp;/* compression type */uint8_t ih_name [ih_nmlen];/* image name */} image_header_t; use iminfo to display the content of this struct. 5. The following prompt is displayed during bootm 3000000 boot: gtw> bootm 3000000 # booting image at 03000000... image name: uClinux kernel and ext2 image type: Blackfin Linux kernel image (gzip compressed) data size: 3000041 bytes = 2.9 MB load address: 00001000 entry point: 00001000 verifying checksum... OK Uncompressing kernel image... okstarting kernel at = 1000 Linux version 2.6.19.3-ADI-2007R1.1-svn (wmz@localhost.localdomain) (GCC route 000000004.1.1 (ADI 07r1) #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: 600 MHz core clock and 60 MHz system clockboard memory: 64 mbkernel managed memory: 64 mbmemory map: text = 0x00001000-0x000b 0db0 init = export data = export stack = 0x000c0000-0x000c2000 BSS = export available = export rootfs = export DMA zone = export cache enableddata cache enabled (write-through) Hardware trace enabledbuilt 1 zonelists. total pages: 13462 kernel command line: Root =/dev/mtdblock0 RW console = ttybf0, 57600 Init =/sbin/init refreshing ing Blackfin priority driven interruptspid 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: 52668 K/64771 k ram, (48 k init code, 703 K kernel code, 47 K data, 1024 k dma) Blackfin scratchpad data SRAM: 4 kbblackfin data_a SRA M: 16 kbblackfin data_ B SRAM: 16 kbblackfin instruction SRAM: 16 kbsecurity framework v1.0.0 initializedcapability LSM initializedmount-Cache hash table entries: 512 Blackfin gpio controllerblackfin DMA controllerezkit_init (): registering device resourcesbf561 core B driver v0.1 initialized. io scheduler Noop registeredio scheduler anticipatory registered (default) Io scheduler CFQ registeredserial: Blackfin serial driverbfin-uart.1: ttybf0 at mmio 0xffc00400 (IRQ = 35) is a BFIN-UARTRAMDISK driver initialized: 16 RAM disks of 4096 K size 1024 blocksizeuclinux [MTD]: ram probe address = 0x3500000 size = 0xa00000creating 1 MTD partitions on "Ram": 0x00000000-0x00a00000: "romfs" uClinux [MTD]: Set romfs: ext2 to be root filesystemvfs: mounted root (ext2 filesystem ). freeing unused kernel memory: 48 k free D (0xb1000-0xbc000) dma_alloc_init: dma_page @ 0x000b8000-256 pages at 0x03f00000no usable address families found. socket: function not implementedunable to create socketunable to create socket welcome: ____ _/__| | _ ____ _/| | // | _ | |__ | _ |/| ___/____ | _ | /____ |/_/| _ | for further INF Ormation see: http://www.uclinux.org/http://blackfin.uclinux.org/ busybox v1.4.1 (11:26:44 Cst) built-in Shell (MSH) Enter 'help' for a list of built-in commands. Root: ~> Unable to create socketunable to create socket... 6. Turn off the network-related options! 7. Last step: Write the uClinux image to norflash and set the environment variable setenv ramboot bootm 20030000 for U-boot to automatically boot to the uClinux prompt.
