+void flash_sector_erase(u8 flash,u8 sector) {
+
+ u32 a18_12;
+ u32 base;
+
+ if(sector>18)
+ return;
+ a18_12=sector_address[sector]<<1;
+
+ if((flash!='0')&(flash!='2'))
+ return;
+
+ switch(flash) {
+ case '0':
+ base=0x80000000;
+ B0F555=0xaa;
+ B0F2AA=0x55;
+ B0F555=0x80;
+ B0F555=0xaa;
+ B0F2AA=0x55;
+ *((volatile u16 *)(base|a18_12))=0x30;
+ break;
+ case '2':
+ base=0x82000000;
+ B2F555=0xaa;
+ B2F2AA=0x55;
+ B2F555=0x80;
+ B2F555=0xaa;
+ B2F2AA=0x55;
+ *((volatile u16 *)(base|a18_12))=0x30;
+ break;
+ default:
+ return;
+ }
+
+ return;
+}
+
+void flash_chip_erase(u8 bank) {
+
+ if((bank!='0')&(bank!='2'))
+ return;
+
+ if(bank=='0') {
+ B0F555=0xaa;
+ B0F2AA=0x55;
+ B0F555=0x80;
+ B0F555=0xaa;
+ B0F2AA=0x55;
+ B0F555=0x10;
+ }
+ else {
+ B2F555=0xaa;
+ B2F2AA=0x55;
+ B2F555=0x80;
+ B2F555=0xaa;
+ B2F2AA=0x55;
+ B2F555=0x10;
+ }
+}
+
+void unlock_bypass(u8 bank) {
+
+ if((bank!='0')&(bank!='2'))
+ return;
+
+ if(bank=='0') {
+ B0F555=0xaa;
+ B0F2AA=0x55;
+ B0F555=0x20;
+ }
+ else {
+ B2F555=0xaa;
+ B2F2AA=0x55;
+ B2F555=0x20;
+ }
+}
+
+void unlock_bypass_reset(u8 bank) {
+
+ if((bank!='0')&(bank!='2'))
+ return;
+
+ if(bank=='0') {
+ B0F=0x90;
+ B0F=0x00;
+ }
+ else {
+ B2F=0x90;
+ B2F=0x00;
+ }
+}
+
+void flash_write(u32 addr,u16 data) {
+
+ *((volatile unsigned short *)addr)=0xa0;
+ *((volatile unsigned short *)addr)=data;
+}
+
+void receive_data_and_write_to_flash(u32 addr,u32 datalen) {
+
+ u8 bank;
+ u32 i;
+ u16 data;
+ u8 byte;
+ u8 cksm;
+
+ /* which bank to program */
+ if(addr<0x82000000)
+ bank='0';
+ else
+ bank='2';
+
+ /* unlock bypass */
+ unlock_bypass(bank);
+
+ /* receive and write data */
+ cksm=0;
+ for(i=0;i<datalen/2;i++) {
+ byte=uart0_get_byte();
+ data=byte;
+ cksm+=byte;
+ byte=uart0_get_byte();
+ cksm+=byte;
+ data|=byte<<8;
+ *((unsigned volatile short *)addr)=0xa0;
+ *((unsigned volatile short *)addr)=data;
+ addr+=2;
+ }
+
+ /* relock bypass */
+ unlock_bypass_reset(bank);
+
+ /* send an ack */
+ uart0_send_byte(cksm);
+}
+