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Enable 440BX NB to use large memory modules 

Signed-off-by: Anders Jenbo <anders@jenbo.dk>
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5508 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Anders Jenbo 2010-04-27 08:45:30 +00:00 committed by Stefan Reinauer
parent 14e2277962
commit 771b0e4228
1 changed files with 28 additions and 6 deletions
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34
src/northbridge/intel/i440bx/raminit.c
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@ -694,6 +694,23 @@ static struct dimm_size spd_get_dimm_size(unsigned int device)
sz.side1 *= 4;
sz.side2 *= 4;
/* It is possible to partially use larger then supported
* modules by setting them to a supported size.
*/
if(sz.side1 > 128) {
PRINT_DEBUG("Side1 was 0x");
PRINT_DEBUG_HEX16(sz.side1);
PRINT_DEBUG(" but only 128MB will be used.\n");
sz.side1 = 128;
if(sz.side2 > 128) {
PRINT_DEBUG("Side2 was 0x");
PRINT_DEBUG_HEX16(sz.side2);
PRINT_DEBUG(" but only 128MB will be used.\n");
sz.side2 = 128;
}
}
return sz;
}
/*
@ -792,6 +809,12 @@ static void set_dram_row_attributes(void)
dra = 0x1; /* 4KB */
} else if (dra == 8) {
dra = 0x2; /* 8KB */
} else if (dra >= 16) {
/* Page sizes larger than supported are
* set to 8KB to use module partially.
*/
PRINT_DEBUG("Page size forced to 8KB.\n");
dra = 0x2; /* 8KB */
} else {
dra = -1;
}
@ -808,6 +831,10 @@ static void set_dram_row_attributes(void)
dra = 0x05; /* 4KB */
} else if (dra == 8) {
dra = 0x0a; /* 8KB */
} else if (dra >= 16) {
/* Ditto */
PRINT_DEBUG("Page size forced to 8KB.\n");
dra = 0x0a; /* 8KB */
} else {
dra = -1;
}
@ -826,7 +853,7 @@ static void set_dram_row_attributes(void)
/*
* 440BX supports asymmetrical dual-sided DIMMs,
* but can't handle DIMMs smaller than 8MB per
* side or larger than 128MB per side.
* side.
*/
struct dimm_size sz = spd_get_dimm_size(device);
if ((sz.side1 < 8)) {
@ -834,11 +861,6 @@ static void set_dram_row_attributes(void)
"are not supported on this NB.\n");
die("HALT\n");
}
if ((sz.side1 > 128)) {
print_err("DIMMs > 128MB per side\n"
"are not supported on this NB\n");
die("HALT\n");
}
/* Divide size by 8 to set up the DRB registers. */
drb += (sz.side1 / 8);