[OpenBIOS] fcode rom loading

[Mark Cave-Ayland]

On 30/06/11 19:40, Bob Breuer wrote:

> Maybe the 4096 in hex is a mistake, and it was intended to be 4096
> decimal.  For now, this patch (probably mangled by my mailer) seems to work:
>
> Index: arch/sparc32/openbios.c
> ===================================================================
> --- arch/sparc32/openbios.c     (revision 1044)
> +++ arch/sparc32/openbios.c     (working copy)
> @@ -27,7 +27,7 @@
>   #include "arch/common/fw_cfg.h"
>   #include "libopenbios/ofmem.h"
>
> -#define MEMORY_SIZE     (16*1024)       /* 16K ram for hosted system */
> +#define MEMORY_SIZE     (128*1024)      /* 128K ram for hosted system */
>   #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)
>
> Index: arch/sparc32/ofmem_sparc32.c
> ===================================================================
> --- arch/sparc32/ofmem_sparc32.c        (revision 1044)
> +++ arch/sparc32/ofmem_sparc32.c        (working copy)
> @@ -21,7 +21,7 @@
>
>   #define OF_MALLOC_BASE         ((char*)OFMEM +
> ALIGN_SIZE(sizeof(ofmem_t), 8))
>
> -#define MEMSIZE (256 * 1024)
> +#define MEMSIZE (512 * 1024)
>   static union {
>          char memory[MEMSIZE];
>          ofmem_t ofmem;
>
>
> I'll take another look at this after shaking out a few more possible bugs.

Ooooh so you can get away with re-arranging the internal memory space to 
find enough space for the fcode tables after all - nice one :)

> Next up is my-address and my-space.  Under OBP on an SS-20, I can do this:
>    ok " /iommu/sbus" select-dev
>    ok new-device
>    ok 0 0 " 1,abc" set-args
>    ok my-address . my-space .
>    abc 1
> With OpenBIOS, I just get zeros for both my-address and my-space.
>
> While skimming the IEEE-1275 spec, I found begin-package, which under
> OpenBIOS does set my-address and my-space correctly.  Am I just missing
> something, or could there be a bug in either set-args or new-device?

Possibly. Bear in mind that OpenBIOS now has a source debugger so you 
can try something like:

" /iommu/sbus" select-dev
new-device
0 0 " 1,abc"
debug set-args
set-args

...and off you go.


HTH,

Mark.

-- 
Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
http://www.siriusit.co.uk
t: +44 870 608 0063

Sirius Labs: http://www.siriusit.co.uk/labs