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Add an option - AR71XX_REALMEM - which overrides the amount of

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memory detected from Redboot, or overrides the "otherwise" case
if no Redboot information was found.

Some AR71XX platforms don't use Redboot (eg TP-LINK devices using
UBoot; some later Ubiquiti devices which apparently also use
UBoot) and at least one plain out lies - the Ubiquiti LS-SR71A
Redboot says there's 16mb of RAM when in fact there's 32mb.

A more "clean" solution will be needed at a later date.
This commit is contained in:
Adrian Chadd 2011-03-27 08:44:27 +00:00
parent 83d59d21b5
commit c720b9bd9e
2 changed files with 20 additions and 0 deletions
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6
sys/conf/options
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@ -872,3 +872,9 @@ SDP opt_ofed.h
SDP_DEBUG opt_ofed.h
IPOIB_DEBUG opt_ofed.h
IPOIB_CM opt_ofed.h
# At least one of the AR71XX ubiquiti boards has a Redboot configuration
# that "lies" about the amount of RAM it has. Until a cleaner method is
# defined, this option will suffice in overriding what Redboot says.
AR71XX_REALMEM opt_global.h

14
sys/mips/atheros/ar71xx_machdep.c
View File

@ -180,6 +180,20 @@ platform_start(__register_t a0 __unused, __register_t a1 __unused,
if (realmem == 0)
realmem = btoc(32*1024*1024);
/*
* Allow build-time override in case Redboot lies
* or in other situations (eg where there's u-boot)
* where there isn't (yet) a convienent method of
* being told how much RAM is available.
*
* This happens on at least the Ubiquiti LS-SR71A
* board, where redboot says there's 16mb of RAM
* but in fact there's 32mb.
*/
#if defined(AR71XX_REALMEM)
realmem = btoc(MIPS_REALMEM);
#endif
/* phys_avail regions are in bytes */
phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
phys_avail[1] = ctob(realmem);