The E3 is based on an ARM reference design, isn't it? What's the feasibility of emulating one?
On Wed, 24 Apr 2019 at 11:46, Ralph Corderoy <ra...@inputplus.co.uk> wrote: > Hi Nick, > > > > That should be possible as you have the files, now without their 16 > > > bytes per 512 bytes overhead. You need to work out how many blocks > > > to erase based on the size of each file you're trying to put back. > > > IIRC I pointed out a block is the unit of erasure and it's 16 KiB. > > > > So e3-nand.0 is 3584 KB so how many blocks go into it…? so how many > > times dose 16KB going in to 3584KB…?? I don’t know..?? I can’t divide. > > Iam a bit ok on Add not brilliant at Times but can’t do Divide. > > Having stripped the excess OOB data, I have these sizes for each file in > bytes. > > 3670016 e3-nand-backup.0 > 262144 e3-nand-backup.1 > 262144 e3-nand-backup.2 > 262144 e3-nand-backup.3 > 28311552 e3-nand-backup.4 > 786432 e3-nand-backup.5 > > You're right, 3,670,016 B is 3,584 KiB because > 3,670,016 / 1,024 = 3,584 > so 1,024 goes into 3,670,016 exactly 3,584 times. > > But the size of the erase block is 16 KiB which is > 16 * 1,024 = 16,384 > so we want to know how many times 16,384 goes into 3,670,016. > 3,670,016 / 16,384 = 224 > 224 is what you worked out in your other email. > > Taking those six sizes above and repeating the same sum gives > > 3,670,016 / 16,384 = 224 > 262,144 / 16,384 = 16 > 262,144 / 16,384 = 16 > 262,144 / 16,384 = 16 > 28,311,552 / 16,384 = 1,728 > 786,432 / 16,384 = 48 > > Now I haven't been carefully following along how to extract > e3-nand-backup.* in the first place, and how to write them back. > I'm aware there's a script involved and a command where one of the > parameters is the number of 16 KiB blocks to erase. Hopefully, plugging > in those numbers above for each of the matching areas will work, but > it's your responsibility whether to go ahead as you're the one actually > doing all this; I've just been sitting at a keyboard. :-) > > -- > Cheers, Ralph. > > _______________________________________________ > e3-hacking mailing list > e3-hacking@earth.li > https://www.earth.li/mailman/listinfo/e3-hacking > -- ┌─── http://www.cowlark.com ─── │ "I have always wished for my computer to be as easy to use as my │ telephone; my wish has come true because I can no longer figure out │ how to use my telephone." --- Bjarne Stroustrup
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