[syslinux] Workaround for "hybriding" large ISO images?

[intrigeri]

Hi,

since the Tails ISO grew from ~900MB to ~1.1GB, we see this warning
when running isohybrid on it:

  isohybrid: Warning: more than 1024 cylinders: 1045
  isohybrid: Not all BIOSes will be able to boot this device

I guess that's fully expected. And, as expected, we get boot failure
reports from users.

So, my question is: is there a "known optimal" combination of
isohybrid options that makes the resulting hybrid'd ISO boot on as
much hardware as possible?

Notes:

  * I've sent a call for testing to the Tails community in order to
    gather experimental results in this area, but it might be that
    someone in here already knows better.

  * We currently use "--entry 4 --type 0x1c", for historical reasons;
    that doesn't impact whether the warning is displayed; however, it
    probably impacts on what hardware the USB stick boots or not.

Cheers,
-- 
intrigeri