SPARC32: Trying to increase machine memory and failing

[Mark Cave-Ayland]

Hi all,

As it still seems there are some memory issues with SPARC32 (even with 
the new patches), I've just tried increasing the memory for the Forth 
machine from 128K to 256K by making the following change in 
arch/sparc32/openbios.c:

--- arch/sparc32/openbios.c     (revision 918)
+++ arch/sparc32/openbios.c     (working copy)
@@ -26,7 +26,7 @@
  #define NO_QEMU_PROTOS
  #include "arch/common/fw_cfg.h"

-#define MEMORY_SIZE     (128*1024)       /* 16K ram for hosted system */
+#define MEMORY_SIZE     (256*1024)       /* 16K ram for hosted system */
  #define DICTIONARY_SIZE (256*1024)      /* 256K for the dictionary   */
  #define UUID_FMT 
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x"
  #define FW_CFG_SUN4M_DEPTH   (FW_CFG_ARCH_LOCAL + 0x00)

However, with this change in place OpenBIOS just freezes on boot after 
emitting "Configuration device id QEMU version 1 machine id 32". Does 
anyone know anything about the SPARC32 memory code to know why changing 
this constant doesn't just work?

ATB,

Mark.

SPARC32: Trying to increase machine memory and failing

[Andreas Färber]

Hi,

Am 25.10.2010 um 11:02 schrieb Mark Cave-Ayland:
> I've just tried increasing the memory for the Forth machine from  
> 128K to 256K by making the following change in arch/sparc32/ 
> openbios.c:
>
> --- arch/sparc32/openbios.c     (revision 918)
> +++ arch/sparc32/openbios.c     (working copy)
> @@ -26,7 +26,7 @@
> #define NO_QEMU_PROTOS
> #include "arch/common/fw_cfg.h"
>
> -#define MEMORY_SIZE     (128*1024)       /* 16K ram for hosted  
> system */
> +#define MEMORY_SIZE     (256*1024)       /* 16K ram for hosted  
> system */
> #define DICTIONARY_SIZE (256*1024)      /* 256K for the dictionary    
> */
> #define UUID_FMT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x 
> %02x%02x%02x%02x%02x"
> #define FW_CFG_SUN4M_DEPTH   (FW_CFG_ARCH_LOCAL + 0x00)
>
> However, with this change in place OpenBIOS just freezes on boot  
> after emitting "Configuration device id QEMU version 1 machine id 32".

I think you need to adjust VMEM_SIZE in arch/sparc32/ldscript  
accordingly...

Andreas

SPARC32: Trying to increase machine memory and failing

[Mark Cave-Ayland]

Andreas Färber wrote:
> I think you need to adjust VMEM_SIZE in arch/sparc32/ldscript 
> accordingly...
>
> Andreas

I've just tried that, and still no dice starting qemu with the new ROM:

./qemu-system-sparc -cdrom /home/build/src/qemu/sparcimage/sol8-cd1.iso 
-boot d -nographic
rom: requested regions overlap (rom 
/home/build/rel-qemu-git/share/qemu/openbios-sparc32. 
free=0x0000000070107000, addr=0x0000000070000000)
rom loading failed

Does this error mean that the ROMs are larger than the memory space 
allocated to them? Given that the SPARC32 ROM appears to load at 
0xffd00000, surely that means the ROM can be a couple of MB without any 
problem? Currently the size on disk of the unstripped ROM is around 
540KB which should be fine.

ATB,

Mark.

SPARC32: Trying to increase machine memory and failing

[Artyom Tarasenko]

On Tue, Oct 26, 2010 at 10:46 AM, Mark Cave-Ayland
 wrote:
> Andreas Färber wrote:
> > I think you need to adjust VMEM_SIZE in arch/sparc32/ldscript
> > accordingly...
> >
> > Andreas
>
> I've just tried that, and still no dice starting qemu with the new ROM:
>
> ./qemu-system-sparc -cdrom /home/build/src/qemu/sparcimage/sol8-cd1.iso
> -boot d -nographic
> rom: requested regions overlap (rom
> /home/build/rel-qemu-git/share/qemu/openbios-sparc32.
> free=0x0000000070107000, addr=0x0000000070000000)
> rom loading failed
>
> Does this error mean that the ROMs are larger than the memory space
> allocated to them? Given that the SPARC32 ROM appears to load at 0xffd00000,
> surely that means the ROM can be a couple of MB without any problem?

Currently not a couple. hw/sun4m.c:

#define PROM_SIZE_MAX        (1024 * 1024)
> Currently the size on disk of the unstripped ROM is around 540KB which
> should be fine.

Yes, should be fine. But looks like you are hitting 512KiB limit somewhere...

SPARC32: Trying to increase machine memory and failing

[Mark Cave-Ayland]

Artyom Tarasenko wrote:
> > Does this error mean that the ROMs are larger than the memory space
> > allocated to them? Given that the SPARC32 ROM appears to load at 0xffd00000,
> > surely that means the ROM can be a couple of MB without any problem?
>
> Currently not a couple. hw/sun4m.c:
>
> #define PROM_SIZE_MAX        (1024 * 1024)

Right - but we should still be well under this limit.
> > Currently the size on disk of the unstripped ROM is around 540KB which
> > should be fine.
>
> Yes, should be fine. But looks like you are hitting 512KiB limit somewhere...

Actually, not even that. If I copy across the unstripped version (which 
is 220K on my system) then I get exactly the same error message. I think 
that the error message here is likely misleading, and it's maybe 
something to do with one of the section sizes in the output binary image 
rather than the entire binary image size.

ATB,

Mark.