On 02/19/2014 01:21 AM, Samuel Thibault wrote: > Re: Bug#738765: boot.img in daily image files exceed 10mb limit This > happens because boot.img exceed a "magic" 10mb limit. > > BTW, do we know the precise value for this issue? It'd be good that > we'd simply add a test during build, to abort it when we overrun the > limit. > > Samuel >
That's a very good question, Samuel. Unfortunately, it's one I don't have a very good answer for. I did do some digging to try to find an answer for you, however. The first below-linked article [1] states that the limit is actually 8 mb, but that 10 mb seems to work for some people. My informal testing seems to bear out the 10 mb limit, since the boot.img for wheezy is just under 10mb, but the 11mb image in jessie doesn't work. I think the actual *reason* for the limit is that sun4u (UltraSPARC I, II, III and IV) machines do not initialize the processor's MMU. Tjhe second below-linked article [2] (and the error message I get when attempting to boot) seems to bear this out, but *that* article states that the limit is actually 4 mb. Again, I know from experience that this is not the case. This article also makes the dubious claim that this isn't a problem on sun4v (UltraSPARC T-series) machines because those machines do initialize the MMU, however, note this old bug report from 2011 where the same problem occurred: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=645657 and that it was reported against a T1000 (sun4v) as well as a V240 (sun4u). TL;DR: I think the limit is 10mb, and previous bug reports suggest this to be true, but other people say different things. [1] http://tldp.org/HOWTO/JavaStation-HOWTO/questionsandtroubleshooting-questionsandtroubleshootingchapter.html#QuestionsandTroubleshooting-TenMBLimitTSSection [2] http://www.funtoo.org/Netboot_image_creation_for_SPARC_machines Thanks, Rob Shinn -- To UNSUBSCRIBE, email to debian-boot-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/348207637853ED47B789AF68514504AA1616020F@ExchangeiSCSI
