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Groups > alt.os.development > #18653
| From | wolfgang kern <nowhere@never.at> |
|---|---|
| Newsgroups | alt.os.development |
| Subject | Re: Secrets on UEFI GPT |
| Date | 2024-02-13 08:40 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <uqf6e5$209vf$1@dont-email.me> (permalink) |
| References | (1 earlier) <up2g4d$3ajrq$1@dont-email.me> <uq5cvj$2lrhf$1@dont-email.me> <uq5hr0$2mmdt$1@dont-email.me> <uq5t74$2op35$1@dont-email.me> <uqf0cq$1vdn9$1@dont-email.me> |
On 13/02/2024 06:57, Paul Edwards wrote: > On 10/02/24 03:08, wolfgang kern wrote: > >> if you have access to any UEFI GPT machine can you please copy me a 512 >> byte hexdump of LBA_1 ? > > I checked the replies but didn't see anyone > post the requested hexdump. > >> this would answer all my open questions on GPT. > > Ok, I don't know anything about GPT, but what I do > know is that my Chinese computer (with Zhaoxin > processor) that has Kylin OS installed has UEFI > enabled, and if I switch to legacy, it no longer > boots. > > But legacy boots PDOS, including from USB stick. > > So after booting PDOS I have done an xychop from > drv81: for 1024 bytes, and here it is: thanks a lot: I convert it to explain what's where LBA_0_MBR 0000.. all zero 01b8 0c 21 27 11 ;mark from formatting 01bc 00 00 01be d3 it's bootable but an unusual value 01bf 14 02 00 ;boot sector start CHS 01c2 EE ;this is an EFI partition 01c3 FF FF FF ;last CHS sector (>> here) 01c6 01 00 00 00 ;GPT is on LBA_1 yet 01ca 3b 9e 12 af ;total disk size (sectors) 2'937'232'955 sectors are 1.5 TB with 512 byte sectors 01ce ... ;all zero 01fe 55 aa ---------- LBA_1 (GPT) 0200 45464920 50415254 ;"EFI PART" 0208 00000100 ;version 1.0020c 5C000000 ;header size 0210 9D526FFC ;CRC 0214 00000000 ;align filler 0218 01000000_00000000 ;header copy LBA (points to itself here) 0220 AF129E3B_00000000 ;backup LBA (the last on disk here) 0228 22000000_00000000 ;first usable LBA (aka wast count) 0230 8E129E3B_00000000 ;last usable LBA (wast 32 at the end too?) 0238 6F892CDF_A452F145 ;DISK GUIDE (now guess where this come from) 0240 96E465FA_F34F6C40 ; _"_ 0248 02000000 00000000 :LBA start of GPT entries array (always 2) 0250 80000000 ;number of GPT entries (128 here ???) 0254 80000000 ;size of a GPT entry (128 as usual) 0258 224BCEB6 ;CRC32 of partition array ------------- ;end of header 025c ..3ff ;all zero > I assume that is GPT, but since UEFI can boot from MBR > (as I mentioned before), maybe it isn't. yeah it is. > I haven't attempted to analyze it. my pleasure to do such:) and it confirms my ideas on how it shall look like. __ wolfgang
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UEFI GPT wolfgang kern <nowhere@never.at> - 2024-01-20 05:16 +0100
Re: UEFI GPT Paul Edwards <mutazilah@gmail.com> - 2024-01-20 23:44 +0800
Re: UEFI GPT wolfgang kern <nowhere@never.at> - 2024-01-21 00:56 +0100
Re: UEFI GPT Paul Edwards <mutazilah@gmail.com> - 2024-01-21 10:04 +0800
Re: UEFI GPT wolfgang kern <nowhere@never.at> - 2024-01-27 09:50 +0100
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-09 15:31 +0100
Re: Secrets on UEFI GPT Herbert Kleebauer <klee@unibwm.de> - 2024-02-09 16:54 +0100
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-09 20:08 +0100
Re: Secrets on UEFI GPT Herbert Kleebauer <klee@unibwm.de> - 2024-02-09 22:03 +0100
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 05:16 +0100
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 09:11 +0100
Re: Secrets on UEFI GPT Paul Edwards <mutazilah@gmail.com> - 2024-02-13 13:57 +0800
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-13 08:40 +0100
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-13 08:45 +0100
Re: Secrets on UEFI GPT scott@slp53.sl.home (Scott Lurndal) - 2024-02-09 15:59 +0000
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-09 20:12 +0100
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-09 20:30 +0100
Re: Secrets on UEFI GPT scott@slp53.sl.home (Scott Lurndal) - 2024-02-09 20:37 +0000
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 05:25 +0100
Re: Secrets on UEFI GPT cross@spitfire.i.gajendra.net (Dan Cross) - 2024-02-10 19:21 +0000
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-11 02:00 +0100
Re: Secrets on UEFI GPT scott@slp53.sl.home (Scott Lurndal) - 2024-02-09 20:34 +0000
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 05:23 +0100
Re: Secrets on UEFI GPT "Alexei A. Frounze" <alexfrunews@gmail.com> - 2024-02-09 20:45 -0800
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 08:59 +0100
Re: Secrets on UEFI GPT cross@spitfire.i.gajendra.net (Dan Cross) - 2024-02-11 01:11 +0000
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-11 07:04 +0100
Re: Secrets on UEFI GPT cross@spitfire.i.gajendra.net (Dan Cross) - 2024-02-11 20:08 +0000
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-11 22:03 +0100
Re: Secrets on UEFI GPT Andy Valencia <vandys@vsta.org> - 2024-02-11 14:38 -0800
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-12 01:48 +0100
Re: Secrets on UEFI GPT JJ <jj4public@outlook.com> - 2024-02-10 20:10 +0700
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 17:05 +0100
Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-14 06:37 +0100
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