Hello Salvador, Yes, this is a very useful feature - we've had it in the chromiumos branch for a while now :-)
I need to read your implementation. Ours is called "fast-verify" which will read and only verify portions of the flash specified with -i arguments. It will also restore content surrounding regions (to address Michael's concern) by aligning the bytes read with the erase size. So if you wish to change a small amount of content within an eraseable block, the entire block will be read and erased. The region specified with -i will be written with new content, and the remaining bytes within the block will have the old content restored. Here's our tree in case you'd like to take a look: https://chromium.googlesource.com/chromiumos/third_party/flashrom/ On Tue, Apr 19, 2016 at 10:48 AM, Salvador Eduardo Tropea < salva...@inti.gob.ar> wrote: > Hi All! > > Now I'm using an FPGA board with 4 MiB of flash, was using one with 128 > kiB. So now the time to read/write/verify the whole memory is enough to > annoy me ;-) > So I tried creating a layout like this: > > <-- > 00000000:00007e2b fpga > 00007e2c:003fffff free > <-- > > Note: yes only 32300 bytes used, the rest can be used for other purposes > (0,77%). > > And then I used "-i fpga". > But it didn't help ... flashrom read the 4 MiB twice (one at the beggining > and another for the verification). > Looking at the code I found a variable named read_all_first with a comment > about the lack of implementation. > So I implemented the needed code to: > 1) Add a command line option to make it 0 (avoiding the big reads). This > option can be used only when at least one image is indicated with -i > 2) Skip the big read when read_all_first is 0. Only the regions indicated > by the user are actually fetched from the memory. > 3) Same for the verification stage. > > Additionally I added a command line option to show the progress, very > usefull for big memories (and impatient users ;-). > > Are these additions desired in the project? If yes: I want to discuss the > implementation details. If no: I'll just keep them for my use. > > Regards, SET > > -- > Ing. Salvador Eduardo Tropea http://utic.inti.gob.ar/ > INTI - Micro y Nanoelectrónica (CMNB) http://www.inti.gob.ar/ > Unidad Técnica Sistemas Inteligentes Av. General Paz 5445 > Tel: (+54 11) 4724 6300 ext. 6919 San Martín - B1650KNA > FAX: (+54 11) 4754 5194 Buenos Aires * Argentina > > > > > > _______________________________________________ > flashrom mailing list > flashrom@flashrom.org > https://www.flashrom.org/mailman/listinfo/flashrom > -- David Hendricks (dhendrix) Systems Software Engineer, Google Inc.
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