Hello everyone, just wanted to report successful read from 8mbit (1mb) MACRONIX MX 25L800(5PC-15G) chip and write to 64mbit (8mb) WINBOND 25Q64F(VAIQ) chip. I've used some old ASUS motherboard dating from May 2009 (could check exact model if needed) asbase for flashing. Booted it into prepared FreeDOS usb stick with flashrom, made backup of MACRONIX chip, hot swapped it with WINBOND chip and flashed it with new image. Everything worked like a charm and thanks so much to all people which created this great tool!
Additionaly, if this will be of any help to somebody, new image / WINBOND chip was for AsRock Extreme 4+ FM2A88M motherboard, downloaded at http://www.asrock.com/mb/AMD/FM2A88M%20Extreme4+/?cat=Download&os=BIOS.V... was 2.80 for "Instant Flash" and encapsulation in BIOS image file found inside ZIP archive (size 8mb+4kb) was trimmed to exactly 8mb using another great tool: https://github.com/LongSoft/UEFITool. Greetings,Marin.