Dear everyone i'm Phuong i living vietnamesepresent, i research chip's atmel (AT91SAM9260) and i want to install u-boot on chip AT91SAM9260 but i have some problem with it, so that i need help from you this is my step build u-boot: step 1: i configure it for chip AT91SAM9260 technical information: Basetext :21f00000 set At45DB041D 0x1C Bus with sdram to 16Bitsstep 2: i build it with gcc,toolchain make 0=/tmp/build distclean make 0=/tmp/build at91sam9260ek_dataflash_cs1_config make 0=/tmp/build allstep 3 : i open samba v2.9 in windows i puts bootstrap v.1.5 in 0x0 i puts u-boot.bin in 8400final: i'm reset my board but i get cksum bad. i don't understand it. can you help me ??? note: i use linux OS(ubuntu 9.04) I am looking forward to hear from you soon