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...> "kernel do all of the heavy lifting", i.e. it doesn't actually try to modify sectors and find blocks, but instead relies on the mounted filesystem and driver? Ah, is *that* why extlinus requires the filesystem to be mounted to run install? Thanks again to both of you! -- Avi Deitcher avi at deitcher.net Follow me http://twitter.com/avideitcher Read me http://blog.atomicinc.com

...s map of all other blocks of ldlinux.sys, so it loads them. 5. Now have all the code we need to read fat32 filesystem, so it does, reads syslinux.cfg, loads c32 files, etc. Is that roughly it? I assume extlinux does the same thing, just has some more knowledge about other filesystems? -- Avi Deitcher avi at deitcher.net Follow me http://twitter.com/avideitcher Read me http://blog.atomicinc.com

...not read the filesystem? Does syslinux --install copy them over and then read the filesystem to know precisely what blocks they are in and then embed the precise block number in the VBR? Where? And if so, does it not leave it vulnerable to the files being moved around? Thanks in advance. -- Avi Deitcher avi at deitcher.net Follow me http://twitter.com/avideitcher Read me http://blog.atomicinc.com

Thanks for the response, Gene. Much appreciated. I didn't get all of it; mind if I follow on below? ldlinux.sys is ldlinux.bin without the VBR (Volume Boot Record) code. > Makes sense. > > 1. Where is the code that goes in the VBR or Block Group 0 padding? > > diskboot.inc. > which appears to be included in diskstart.inc. I will have to dig in and see how this all gets

...this work is "on the side" OSS, and not part of work (I spend my days consulting on cloud product strategy and operations, devops transformations, etc. - but the engineer in me always is the engineer in me), afraid to go down that rabbit hole! Deeply appreciative again, Ady. Avi -- Avi Deitcher avi at deitcher.net Follow me http://twitter.com/avideitcher Read me http://blog.atomicinc.com

On Tue, Jan 2, 2018 at 1:03 PM, Avi Deitcher <avi at deitcher.net> wrote: > Thanks for the response, Gene. Much appreciated. I didn't get all of it; > mind if I follow on below? > >> ldlinux.sys is ldlinux.bin without the VBR (Volume Boot Record) code. > > Makes sense. > >> > 1. Where is the code tha...

...ors? Or is it nothing, and just use the VBR? 2. When loading the VBR, it skips over the bytes reserved for boot instruction, name, and FAT32 EBPB? Ah, right, I see it in the ldlinux.bin. First 11 bytes are jump instruction and SYSLINUX label, then all nulls where the EBPB would be. Nice. -- Avi Deitcher avi at deitcher.net Follow me http://twitter.com/avideitcher Read me http://blog.atomicinc.com

On Sat, Jan 6, 2018 at 12:34 PM, Avi Deitcher <avi at deitcher.net> wrote: >> > Is the build process documented? Or am I just going to have to plod >> > through >> > the makefiles? >> >> I don't think so. > Oh well... >> > 1. Run installer >> > 2. Installer loads ldlinux.s...

...ller would be the simplest/quickest > solution. But even so, it installs the first 512 bytes in the VBR, then those bytes need to find the next bytes (ldlinux.sys). Even if I use the installer, and then move the files, unless the actual blocks remain the same, it will be lost, right? -- Avi Deitcher avi at deitcher.net Follow me http://twitter.com/avideitcher Read me http://blog.atomicinc.com

...t) Don't I know it! Been reading and re-reading and re-evaluating, etc. those articles for months. Challenged myself by writing a golang driver for fat32. ext4 is next on the list (some very odd design stuff in there, mostly because of ext2-3 legacy, I suppose). Thanks again, Ady Avi -- Avi Deitcher avi at deitcher.net Follow me http://twitter.com/avideitcher Read me http://blog.atomicinc.com

On Wed, Jan 3, 2018 at 2:38 AM, Avi Deitcher <avi at deitcher.net> wrote: > Gene, thanks for doing "Reply-All". I only get digest, so this keeps me in > the loop. Appreciated. > >> > which appears to be included in diskstart.inc. I will have to dig in and >> > see >> > how this all gets comp...

On Mon, Jan 1, 2018 at 11:06 AM, Avi Deitcher via Syslinux <syslinux at zytor.com> wrote: > Hi Syslinuxers, > > I am trying to understand the basic load chain in fat32 and ext4. I dug > into the assembly for MBR, which is pretty straightforward: > > 1. Find boot partition (or use the pre-defined one at byte 440 for >...