Re: [Qemu-ppc] Apple's BootX

[Programmingkid]

> On Jan 25, 2018, at 10:01 AM, Jd Lyons <address@hidden> wrote:
> 
> In an effort to figure out why qemu-system-ppc hangs at BootX when using some 
> emulated and KVM CPU’s, I suppose it would be good to enter some breakpoints 
> in the code.
> 
> I found some BootX sources at:
> 
> https://opensource.apple.com/tarballs/BootX/
> 
> Tho I’m not sure what versions correspond to which release of OS X?
> 
> And it’s not clear how to build them, tho I haven’t tried yet.
> 
> I found some info on BootX as well as some idea how to do what I’m looking to 
> do:
> 
> https://people.ffii.org/~zoobab/bh.udev.org/filez/apple/mac6100/BootX.pdf
> 
> There are few other useful debugging tech- niques. Setting "auto-boot?" to 
> false will cause the system to enter the OpenFirmware User In- terface by 
> default. Changing kFailToBoot to 0 in include.tproj/sl.h will alter BootX’s 
> default be- havior on error, so that it will return to Open- Firmware. 
> Finally, calling Enter(), will cause BootX to drop back into the OpenFirmware 
> User Interface. This can be used as a break point. The "dumpl" word will dump 
> some memory, by en- tering the address, then the length, then "dumpl". By 
> calling printf in BootX immediately before En- ter(), the address can be 
> easily determined, and the variable can then be examined and altered from 
> OpenFirmware. Finally typing the "go" command will resume BootX’s execution. 
> 
> 
> I noted when I boot from boot usb0/disk:3,\\:tbxi while holding command+v 
> BootX sends some info to the screen, seemingly via open firware, while 
> displaying the “Apple Logo” boot graphic. The info show some of the boot 
> process and what stage it’s loading” loading mach_kernel’ “ loading the 
> .mkext”
> 
> It would be nice to get this output going via Open Bios, if anyone has any 
> idea how I might be able to do that?

Have you tried adding "-prom-env boot-args=-v" to QEMU's arguments yet?