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New system area type 6 = DEC Alpha SRM boot sector.

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New API calls iso_image_set_alpha_boot(), iso_image_get_alpha_boot().
Thanks to Helge Deller.
This commit is contained in:
Thomas Schmitt
2015-02-28 15:13:38 +01:00
parent 9c33eb5f10
commit 782bb7854e
9 changed files with 269 additions and 21 deletions
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39
doc/boot_sectors.txt
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@ -1104,7 +1104,44 @@ Byte Range | Value | Meaning
------------------------------------------------------------------------------
>>> ??? DEC Alpha
DEC Alpha SRM boot sector
for Alpha architecture
Sources:
http://www.tldp.org/HOWTO/text/SRM-HOWTO
SRM Firmware Howto - Rich Payne, and David Huggins-Daines
cdrkit-1.1.10/genisoimage/boot-alpha.c
by Steve McIntyre
who states "Heavily inspired by isomarkboot by David Mosberger in 1996"
mail conversations with Helge Deller
The SRM firmware expects a Secondary Bootstrap Loader program, which usually
is a data file of the ISO filesystem. This loader is announced by size and
block address in the first 512 bytes of the System Area.
SRM accepts the boot sector and executes the loader if the checksum matches.
All numbers are recorded as unsigned 64 bit little endian.
Boot sector components:
Byte Range | Value | Meaning
---------- | ---------- | ----------------------------------------------------
0 - ? | boot_string| genisoimage writes
| | "Linux/Alpha aboot for ISO filesystem."
| | with terminating zero byte.
| |
? - 479 | 0 | Unused / undefined.
| |
480 - 487 | length | Size of boot loader file in units of 512 bytes.
| |
488 - 495 | address | LBA of the boot loader file in units of 512 bytes.
| |
496 - 503 | flag | "Always 0"
| |
504 - 511 | checksum | Sum of 64 bit words 0 to 63 (bytes 0 to 503).
| |
---------- | ---------- | ----------------------------------------------------
------------------------------------------------------------------------------