VFS: Unable to mount root fs via NFS, trying floppy. VFS: Cannot open root device "nfs" or unknown-block(2,0): error -6 Please append a correct "root=" boot option; here are the available partitions: b300 1931264 mmcblk0 driver: mmcblk b301 1930240 mmcblk0p1 00000000-0000-0000-0000-000000000000 Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0) 【阅读全文】
一、电源是系统的血脉,要舍得成本,这对产品的稳定性和通过各种认证是非常有好处的。1.尽量采用∏型滤波,增加10uH电感,每个芯片电源管脚要接104旁路电容;. W0 I. c. [* M* l' p2.采用压敏电阻或瞬态二极管,抑制浪涌;3.模电和数电地分开,大电流和小电流地回路分开,采用磁珠或零欧电阻隔开;4.设计要留有余量,避...【阅读全文】