[ 0.525000] NTFS driver 2.1.30 [Flags: R/W]. [ 0.525000] JFFS2 version 2.2. (NAND) (SUMMARY) 漏 2001-2006 Red Hat, Inc. [ 0.530000] msgmni has been set to 116 [ 0.540000] io scheduler noop registered [ 0.540000] io scheduler deadline registered [ 0.540000] io scheduler cfq registered (default) [ 0.570000] Console: switching to colour frame buffer device 60x34 [ 0.575000] fb0: s3c2410fb frame buffer device [ 0.595000] s3c2440-uart.0: ttyS0 at MMIO 0x50000000 (irq = 70) is a S3C2440 [ 0.600000] s3c2440-uart.1: ttyS1 at MMIO 0x50004000 (irq = 73) is a S3C2440 [ 0.605000] s3c2440-uart.2: ttyS2 at MMIO 0x50008000 (irq = 76) is a S3C2440 [ 0.615000] brd: module loaded [ 0.640000] loop: module loaded [ 0.650000] S3C24XX NAND Driver, (c) 2004 Simtec Electronics [ 0.650000] s3c24xx-nand s3c2440-nand: Tacls=3, 29ns Twrph0=7 69ns, Twrph1=3 29ns [ 0.655000] s3c24xx-nand s3c2440-nand: NAND soft ECC [ 0.660000] NAND device: Manufacturer ID: 0xec, Chip ID: 0xda (Samsung NAND 256MiB 3,3V 8-bit) [ 0.665000] Scanning device for bad blocks [ 0.705000] Bad eraseblock 620 at 0x000004d80000 [ 0.705000] Bad eraseblock 649 at 0x000005120000 [ 0.720000] Bad eraseblock 858 at 0x000006b40000 [ 0.725000] Bad eraseblock 903 at 0x0000070e0000 [ 0.790000] Creating 4 MTD partitions on "NAND": [ 0.790000] 0x000000000000-0x000000100000 : "u-boot === 1M" [ 0.805000] 0x000000100000-0x000000500000 : "App === 4M" [ 0.810000] 0x000000500000-0x000000a00000 : "Kernel === 5M" [ 0.815000] 0x000000a00000-0x000010000000 : "FS === ALL" [ 0.825000] UBI: attaching mtd3 to ubi0 [ 0.825000] UBI: physical eraseblock size: 131072 bytes (128 KiB) [ 0.830000] UBI: logical eraseblock size: 129024 bytes [ 0.835000] UBI: smallest flash I/O unit: 2048 [ 0.840000] UBI: sub-page size: 512 [ 0.845000] UBI: VID header offset: 512 (aligned 512) [ 0.850000] UBI: data offset: 2048 [ 1.175000] UBI: max. sequence number: 39 [ 1.200000] UBI: attached mtd3 to ubi0 [ 1.200000] UBI: MTD device name: "FS === ALL" [ 1.205000] UBI: MTD device size: 246 MiB [ 1.210000] UBI: number of good PEBs: 1964 [ 1.210000] UBI: number of bad PEBs: 4 [ 1.215000] UBI: number of corrupted PEBs: 0 [ 1.220000] UBI: max. allowed volumes: 128 [ 1.225000] UBI: wear-leveling threshold: 4096 [ 1.230000] UBI: number of internal volumes: 1 [ 1.235000] UBI: number of user volumes: 1 [ 1.240000] UBI: available PEBs: 0 [ 1.245000] UBI: total number of reserved PEBs: 1964 [ 1.250000] UBI: number of PEBs reserved for bad PEB handling: 19
这样的界面看着貌似很高端；很多人误认为前面是系统启动的时间，其实不然。
打印出的是系统启动到打印时刻的系统的tick值，printk实现的时候内部附加上的。
硬件给内核提供一个系统定时器用以计算和管理时间，内核通过编程预设系统定时器的频率，即节拍率（tick rate),每一个周期称作一个tick(节拍）。Linux内核从2.5版内核开始把频率从100调高到1000（当然带来了很多优点，也有一些缺点）.
那么如何添加呢？
make menuconfig
Kernel hacking --->
[*] Show timing information on printks
OK，重新编译下载即可看到效果。
时间： 2024-10-12 19:30:50