Hi linux-mips@xxxxxxxxxxxxxx, We use the CSB350 (CPU is A1100) and use the uMon ,too. There are some questions after our zImage is tftped to the RAM. the reason may be the file format of the zImage. Would you please tell us your zImage is an ELF file or other file format? [root@server tftpboot]# file zImage zImage: ELF 32-bit LSB MIPS-I executable, MIPS, version 1 (SYSV), statically linked, not stripped uMON>tfs ls Name Size Location Flags Info boot 52 0xbf953f4c e hello 8938 0xbf95632c e monrc 322 0xbf953d1c e envsetup netcfg 322 0xbf9539dc e envsetup zImage 347336 0xbf8fecac e zImage2 685692 0xbf9ffd5c e Total: 6 items listed (1042662 bytes). uMON>tfs run zImage Command not found: .ELF.. Terminating script 'zImage' at line 1 uMON> uMON> uMON>tfs cp zImage 0xa0300000 uMON>dm 0xa0300000 a0300000: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 .ELF............ a0300010: 02 00 08 00 01 00 00 00 00 00 00 81 34 00 00 00 ............4... a0300020: 90 38 05 00 01 01 00 00 34 00 20 00 03 00 28 00 .8......4. ...(. a0300030: 0b 00 08 00 00 00 00 70 00 60 00 00 00 60 00 81 .......p.`...`.. a0300040: 00 60 00 81 18 00 00 00 18 00 00 00 04 00 00 00 .`.............. a0300050: 04 00 00 00 01 00 00 00 00 10 00 00 00 00 00 81 ................ a0300060: 00 00 00 81 70 4b 00 00 70 4b 00 00 05 00 00 00 ....pK..pK...... a0300070: 00 10 00 00 01 00 00 00 00 60 00 00 00 60 00 81 .........`...`.. Best regards, > Yong Tao > Insitute of Manufacture Engineering of Chongqing University, > Chongqing, > China > 400030 > tel:(+8623)65111224-108 > (+86)13752931429