Some of these binaries are build & linked using eCos. For source for the flash drivers, see: http://ecos.sourceware.org/ 1. GDB startup script for debugging purposes. # startup script for debugging flash erase target remote 10.0.0.56:2001 monitor halt monitor reset load # stack monitor rm 13 0x7000 # pc monitor rm 15 0x8000 # arg1 to erase() monitor rm 0 0x1030000 # arg2 to erase() monitor rm 1 0x10000 stepi 2. Uploading flash driver via tftp $ tftp 10.0.0.108 tftp> binary tftp> put at91fr40162.bin 10.0.0.108:/config/flashdriver.bin Sent 4048 bytes in 0.1 seconds tftp> 4. Programming flash eCosBoard_prog 0x1000000 /config/testdata.bin tftp> put /cygdrive/c/workspace/ecosboard/ecosboard/phi/bootloader/images/bootloader.bin 10.0.0.108:/config/test.bin Sent 165724 bytes in 3.9 seconds halt reg cpsr 0x000000D3 mww 0xFFE00020 0x1 mww 0xFFE00024 0x00000000 mww 0xFFE00000 0x01002539 eCosBoard_profile eCosBoard_prog /config/test.bin 0x1000000 eCosBoard_profile_done set remote memory-write-packet-size fixed set remote memory-write-packet-size 8192 set remote memory-map-packet on target remote 10.0.0.108:3333 monitor halt monitor reg cpsr 0x000000D3 monitor mww 0xFFE00020 0x1 monitor mww 0xFFE00024 0x00000000 monitor mww 0xFFE00000 0x01002539 monitor eCosBoard_profile load monitor eCosBoard_profile_done source /tmp/ecosboard/packages/services/profile/gprof/current/host/gprof.gdb gprof_dump shell cp gmon.out /tmp/ecosboard/build/src echo To view: cd /tmp/ecosboard/build/src && gprof openocd Performance problems: It seems the problem is that the actual flash programming takes time. hal_delay_us() is invoked between each time the CPU is polled for whether flash programming has completed. Flat profile: Each sample counts as 0.01 seconds. % cumulative self self total time seconds seconds calls Ts/call Ts/call name 35.82 37.66 37.66 hal_delay_us 11.90 50.17 12.51 arm7tdmi_clock_out 9.86 60.54 10.37 gdb_get_packet 5.36 66.17 5.63 memcpy 4.34 70.73 4.56 target_buffer_get_u32 3.34 74.25 3.51 embeddedice_read_reg_w_che ck 1.39 75.71 1.46 arm7_9_write_memory 1.34 77.11 1.40 cyg_tcp_output 1.33 78.51 1.40 __udivsi3 1.11 79.68 1.17 cyg_tcp_input 1.07 80.80 1.13 arm7tdmi_store_word_regs 0.95 81.81 1.00 __udivdi3 0.95 82.80 1.00 __umodsi3 0.93 83.78 0.98 arm7tdmi_write_core_regs 0.86 84.68 0.91 arm7_9_poll 0.85 85.57 0.89 memset 0.77 86.38 0.81 cyg_splx 0.64 87.05 0.67 cyg_in_cksumdata 0.63 87.71 0.66 openeth_deliver 0.57 88.31 0.60 strstr 0.51 88.85 0.53 eth_drv_recv 0.49 89.36 0.52 cyg_splinternal 0.49 89.88 0.52 cyg_splimp 0.46 90.36 0.48 cyg_ip_input