wrstuden@netbsd.org wrote:

> The question is: for "partition 0" loading on OF 1 & 2, does it have to be
> set to where the code will expect to run? Can it be set somewhere else?
> *Must* it be set somewhere else?

I guess load-base is only used to load and execute xcoff files.
For "partition x", Openfirmware uses addresses stored
in the Apple partition map.

macppc/stand/installboot/installboot.c:writeapplepartmap() writes
"faked" partition map entries to set address and length where bootxx
(i.e. primary bootloader) should be loaded:
---
	/* block 2: NetBSD partition */
	memset(&pme, 0, sizeof(pme));
	pme.pmSig = DPME_MAGIC;
	pme.pmMapBlkCnt = 2;
	pme.pmPyPartStart = 4;
	pme.pmPartBlkCnt = pme.pmDataCnt = 0x7fffffff;
	strcpy(pme.pmPartName, "NetBSD");
	strcpy(pme.pmPartType, "NetBSD/macppc");
	pme.pmPartStatus = 0x3b;
	pme.pmBootSize = 0x400;
	pme.pmBootLoad = 0x4000;
	pme.pmBootEntry = 0x4000;
	strcpy(pme.pmProcessor, "PowerPC");

	if (lseek(fd, 1024, SEEK_SET) != 1024)
		return -1;
	if (write(fd, &pme, 512) != 512)
		return -1;
---
The loaded bootxx will load ofwboot (i.e. secondary loader) at address
of "entry_point", which is set by installboot.c:loadblocknums().

> The essence of the question though is will the "partition 0" code need to
> have its load address at 600000? If so, that means we need ofwboot.xcf and
> ofwboot.elf that load not at 600000, and ofwboot that loads at 600000.

The load address for ofwboot is defined in installboot.c as DEFAULT_ENTRY.
Current DEFAULT_ENTRY value is 0x600000, but I guess it could be changed.
---
Izumi Tsutsui
tsutsui@ceres.dti.ne.jp