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maman
Master Flasher
Joined: 31 Mar 2002
Posts: 161
Location: Taka Bonerate National Park, Indonesia
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 Posted: Thu May 20, 2004 3:34 am
Post subject: how to build 128KB bios image out of 256 kbyte bios image ? |
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I've successfully release "unneeded" stuff from my mainboard bios without loss of any important functionality. The "unneeded" stuff is the EPA logo, and a custom EPA procedure (procedure to display the EPA logo). The size of this new image is a bit less than 128Kbyte (compressed), but the original size of the bios image is 256Kbyte, hence cbrom or modbin will always emit 256Kbyte image out of this modified image. I intend to make it just 128 Kbyte image, and I have 128Kbyte flash chip to experiment with it. Is it possible at all to make a new 128 kbyte image? if it's possible then how to accomplish it?
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Rainbow
The UniFlasher
Joined: 20 Mar 2002
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Location: Slovakia
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sulbert
Master Flasher
Joined: 17 Jul 2002
Posts: 204
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| Posted: Mon May 31, 2004 11:00 am
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| This feature was still under development in the last available version of BP.
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maman
Master Flasher
Joined: 31 Mar 2002
Posts: 161
Location: Taka Bonerate National Park, Indonesia
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| Posted: Mon May 31, 2004 3:30 pm
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aha.., I see  . I've been "studying" BP for several weeks. I haven't got anytime testing it, but it's a very nice software. Thx, for the info. BP didn't mention about that feature in its readme file.
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sulbert
Master Flasher
Joined: 17 Jul 2002
Posts: 204
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| Posted: Mon May 31, 2004 3:51 pm
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says:
| Code: | | /u - "ultrapack": packs 2Mbit/4Mbit-BIOS to 1Mbit (N/A - in development) |
As far as I have understood the thing, the main idea behind this are better (more effective) compression routines.
Last edited by sulbert on Mon Jun 14, 2004 7:24 am; edited 1 time in total |
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maman
Master Flasher
Joined: 31 Mar 2002
Posts: 161
Location: Taka Bonerate National Park, Indonesia
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| Posted: Sat Jun 12, 2004 3:52 am
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a better compression routine  . AFAIK, bios is LZH compressed, so it must still a variant of the LZH. This BP is really interesting  .
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sulbert
Master Flasher
Joined: 17 Jul 2002
Posts: 204
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| Posted: Mon Jun 14, 2004 7:55 am
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| maman wrote: | | so it must still a variant of the LZH |
Why? The uncompress routine is also replaceable, isn't it?
Last edited by sulbert on Tue Jun 15, 2004 11:19 am; edited 1 time in total |
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maman
Master Flasher
Joined: 31 Mar 2002
Posts: 161
Location: Taka Bonerate National Park, Indonesia
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| Posted: Tue Jun 15, 2004 11:14 am
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yup right, I'm just fool enough right now, not being able to implement a better compression routine in assembly language other than variant of the "moving window" such as LZH  to meet the small space requirement in the BIOS.
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apple_rom
Use my patch at your own risk!!
Joined: 07 Jan 2003
Posts: 125
Location: Minsk
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| Posted: Sun Jul 18, 2004 2:23 pm
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| Quote: | | Is it possible at all to make a new 128 kbyte image? |
It`s possible. I even once upon a time successfully this do. But this anymore was required, therefore so and not realize this possibility in its program (though on 80% has written).
| Quote: | | if it's possible then how to accomplish it |
1. remove ALL not-used files. (as a rule, stays only "original.tmp" and "awardext.rom").
2. place original.tmp in begin of 128k-bios.
3. awardext.rom place in the end of him and some not-used places (u can divide by some parts).
4. rewrite unpacking-procedure in boorblock - after unpacking "original.tmp" so to first was going to from pieces your awardext.rom on original.tmp-place, and after that uncompress him...
Some comments - you not will have no DMI/ESCD, and must to remove CRC-checking...
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maman
Master Flasher
Joined: 31 Mar 2002
Posts: 161
Location: Taka Bonerate National Park, Indonesia
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| Posted: Mon Jul 19, 2004 3:20 pm
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| apple_rom wrote: |
1. remove ALL not-used files. (as a rule, stays only "original.tmp" and "awardext.rom").
2. place original.tmp in begin of 128k-bios.
3. awardext.rom place in the end of him and some not-used places (u can divide by some parts).
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I have done this . The another two haven't yet. I'll try later. Thx
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