[U-Boot] Between 2015.10 and 2016.01, SPI flash changed erase size, and saveenv stopped working

Hi!

On board with Altera Cyclone 5:

=> version

U-Boot 2016.01-05658-g81689ec (May 29 2016 - 22:25:45 +0200) arm-linux-gnueabi-gcc (GCC) 4.8.2 GNU ld (GNU Binutils) 2.24 Saving Environment to SPI Flash... spi_flash_std_probe: slave=0bf367d0, cs=0 SF: Detected N25Q512 with page size 256 Bytes, erase size 64 KiB, total 64 MiB offset 0x40000 is protected and cannot be erased

...

=> version

U-Boot 2015.10-04078-g3b6d086 (May 29 2016 - 22:33:36 +0200) arm-linux-gnueabi-gcc (GCC) 4.8.2 GNU ld (GNU Binutils) 2.24 SF: Detected N25Q512 with page size 256 Bytes, erase size 4 KiB, total 64 MiB

Does anyone else see the problem? Any ideas?

Best regards, Pavel