[flashrom] flashrom support for SST26VF064B

[Wei Hu]

Hi flashrom folks,

I'm trying to add support for SST26VF064B after I got a patch from Elias. I
made some changes to it after reading the datasheet, but none of the block
erasing commands worked, and I don't know why...

Erasing and writing flash chip... *Trying erase function 0...
0x000000-0x000fff*:E
program_opcodes: preop=5006 optype=463b opmenu=05200302c79f0190
on-the-fly *OPCODE (0x20)* re-programmed, op-pos=2
FAILED at 0x00000010! Expected=0xff, Found=0x5a, failed byte count from
0x00000000-0x00000fff: 0x83
ERASE FAILED!
Reading current flash chip contents... done. Looking for another erase
function.
*Trying erase function 1... 0x000000-0x00ffff*:E
program_opcodes: preop=5006 optype=463b opmenu=05d80302c79f0190
on-the-fly *OPCODE (0xD8)* re-programmed, op-pos=2
FAILED at 0x00000010! Expected=0xff, Found=0x5a, failed byte count from
0x00000000-0x0000ffff: 0xdf16
ERASE FAILED!
Reading current flash chip contents... done. Looking for another erase
function.
*Trying erase function 2... 0x000000-0x7fffff*:EFAILED at 0x00000010!
Expected=0xff, Found=0x5a, failed byte count from 0x00000000-0x007fffff:
0x702b2a
ERASE FAILED!
Looking for another erase function.
No usable erase functions left.
FAILED!

It tried the commands for erasing 4KB, 64KB, 8MB, and all failed...

This is basically what I had in the block_erasers[] array. Full diff is
attached. Thanks for your help!

                {
                        {
                                .eraseblocks = { {4 * 1024, 2048} },
                                .block_erase = spi_block_erase_20,
                        }, {
                                .eraseblocks = { {64 * 1024, 128} },
                                .block_erase = spi_block_erase_d8,
                        }, {
                                .eraseblocks = { {8 * 1024 * 1024, 1} },
                                .block_erase = spi_block_erase_c7,
                        },
                },
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