[flashrom] [PATCH/FULL/SVN] Support for 4-bytes addressing SPI flash chips 32MB+ (256Mb+)

Amelkin, Aleksandr Aleksandr.Amelkin at t-platforms.ru
Fri Jan 16 10:16:13 CET 2015

> > Flashrom is slow because read and erase operations are written very
> > slow now. They could be easily changed to become faster in times or in
> > 10s of times. Probably I'll do this later. This should be another patch.
> I'll try to describe where these issues are...
> The read issue is in spi_read_chunked. There is a loop that reads data by
> pages (normally by 256 bytes). So, to read 32 MB flash we'll send 131k read
> commands with 3-7 ms wait for each. 

Everything you say is true and optimizations you propose would be very helpful,
but the main question is - what introduces this 3-7ms delays. That is NOT flashrom,
nor it is libfti, nor libusb. The flash chips also don't seem to require millisecond delays
for READ/READ4B commands.

With best regards -
Alexander Amelkin,
T-Platforms [http://www.t-platforms.com]

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