you may want to study arm, which is Samsung ARM7 44b0x in BSP, functions very powerful, source code is written by others, I do some of these procedures, a footnote to hope it may be useful.

基于44b0的BSP
.............\39VF160.C
.............\44B0Sch.pdf
.............\44BINIT.S
.............\arp.c
.............\bios.apj
.............\bios44b0.mcp
.............\console.c
.............\ctrl_set.c
.............\eth.c
.............\icmp.c
.............\inc
.............\...\39vf160.h
.............\...\44B0X.H
.............\...\arp.h
.............\...\bios.h
.............\...\config.h
.............\...\console.h
.............\...\ctrl_set.h
.............\...\DataType.h
.............\...\eth.h
.............\...\icmp.h
.............\...\ip.h
.............\...\mac.h
.............\...\MemCfg.s
.............\...\Option.s
.............\...\Rtl8019.h
.............\...\skbuff.h
.............\...\tftp.h
.............\...\tftpput.h
.............\...\udp.h
.............\...\utils.h
.............\ip.c
.............\mac.c
.............\main.c
.............\MEMCFG.A
.............\Option.a
.............\skbuff.c
.............\tftp.c
.............\tftpmain.c
.............\tftpput.c
.............\udp.c
.............\utils.c

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