Problem programming PBL on LS1088A

[suezure]

My custom board is boot from qspi flash, now I'm in trouble with programming RCW/BL2(bl2_qspi.pbl) to qspi flash at offset 0x0~0x40000.

Commands as follow:

sf probe

mw 0xb0000000 0 0x4000000   //fill 0xb0000000~0xbfffffff with all 0s

tftp 0xb0000000 bl2_qspi.pbl   //size of 0x13491

sf erase 0x0 0x40000                //necessarily erase 256Kbytes with s25fs512

sf write 0xb0000000 0x9000 0x40000 

When I try to erase flash, I found that offset at 0x0~0x8000 can not be erased or modified.

After I programming flash, board can not boot any more.

Same situation when I try to programming firmware_ls1088ardb_pb_uboot_qspiboot.img, 

Is there any protection of writing else while I tried sf protect unlock 0x0 0x40000?

[suezure]

Finally I found that  U-BOOT erase spi flash with 256K uniform sector architecture while flash(Spansion S25FS512S) have 8 4KBytes sectors on the top/bottom of address, which cause 256K uniform erase failed. After modified 20h_NV =1 of Status/Config Register, flash erase normally. 

[ufedor]

Please try to boot from SD card and use U-Boot to program SPI Flash or use CodeWarrior Flash Programmer.

Also it is possible to check the SPI Flash datasheet concerning the sectors protection options.