+int send_cmd(int sfd,u32 addr,u32 len,u8 cmd) {
+
+ int ret,i,cnt,size;
+ int as,ls;
+ u8 send[9];
+
+ switch(cmd) {
+ case CMD_READ:
+ case CMD_WRITE:
+ as=4;
+ ls=4;
+ break;
+ case CMD_CHIP_ERASE:
+ as=0;
+ ls=1;
+ break;
+ default:
+ printf("send cmd: cmd '%02x' not supported\n",cmd);
+ return -1;
+ }
+
+ size=1+as+ls;
+ send[0]=cmd;
+
+ for(i=0;i<as;i++)
+ send[1+i]=(addr>>((as-1-i)*8))&0xff;
+ for(i=0;i<ls;i++)
+ send[1+i+as]=(len>>((ls-1-i)*8))&0xff;
+
+ cnt=0;
+ while(size) {
+ ret=write(sfd,send+cnt,size);
+ if(ret<0) {
+ perror("dump file: send cmd ");
+ return ret;
+ }
+ size-=ret;
+ cnt+=ret;
+ }
+
+ return 0;
+}
+
+int write_to_flash(t_lpc *lpc,u8 *buf,u32 addr,int len) {
+
+ int cnt,size,ret;
+ u8 cksm;
+
+ /* send cmd */
+ send_cmd(lpc->sfd,addr+lpc->roff,len,CMD_WRITE);
+
+ /* transfer data */
+ cnt=0;
+ cksm=0;
+ while(len) {
+ size=2;
+ while(size) {
+ ret=write(lpc->sfd,buf+cnt,2);
+ if(ret<0) {
+ perror("transmit flash content");
+ return ret;
+ }
+ size-=ret;
+ }
+ cksm+=buf[cnt];
+ cksm+=buf[cnt+1];
+ cnt+=2;
+ len-=2;
+ }
+
+ /* check ack */
+ ret=read(lpc->sfd,buf,1);
+ if(ret<0) {
+ perror("write to flash: ack rx");
+ return ret;
+ }
+ if(buf[0]!=cksm) {
+ printf("FATAL: write to ram: wrong checksum!\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+int firmware_to_mem(t_lpc *lpc,u8 memtype) {