Hi,
I've tried to add support to Qemu (and OpenBIOS) for more than 4G of
memory for the Sparc32 target. But now it seems that Linux can't use
this memory after all. The first show stopper is this code in
arch/sparc/prom/memory.c:
111 /* Grrr, have to traverse the prom device tree ;( */
112 node = prom_getchild(prom_root_node);
113 node = prom_searchsiblings(node, "memory");
114 num_regs = prom_getproperty(node, "available",
115 (char *) prom_reg_memlist,
116 sizeof(prom_reg_memlist));
117 num_regs = (num_regs/sizeof(struct linux_prom_registers));
118 for(iter=0; iter<num_regs; iter++) {
119 prom_phys_avail[iter].start_adr =
120 (char *) prom_reg_memlist[iter].phys_addr;
121 prom_phys_avail[iter].num_bytes =
122 (unsigned long)
prom_reg_memlist[iter].reg_size;
123 prom_phys_avail[iter].theres_more =
124 &prom_phys_avail[iter+1];
125 }
Here prom_reg_memlist[iter].which_io is not used at all. It would be
needed to access the memory above the first 4G.
Some real Sparc32 machines could have >4G RAM (SC2000), maybe nobody
tried to run Linux on those. The BSDs aren't any better.
Will this ever be fixed? Anybody out there with a real machine and
lots of memory?
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