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baytrail: Reserve memory between ASEG and 1MB and for ramoops

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Low system tables are in this region, and it is probably safer
to keep ASEG reserved.

Also keep the region used by ramoops from being used by the OS
and from being cleared by developer mode boots.

Lots more work needed to make the ACPI tables fully functional.

BUG=chrome-os-partner:23505
BRANCH=rambi
TEST=boot on rambi and see that the kernel finds RSDP and uses ACPI

Change-Id: I4f7064d3cff14a3ecf15b194a1f20c1fa9d5e134
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/175554
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Duncan Laurie 2013-11-03 19:38:12 -08:00 • committed by chrome-internal-fetch
commit 588c6623ec
1 changed files with 14 additions and 0 deletions
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14
src/soc/intel/baytrail/northcluster.c
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@ -117,6 +117,20 @@ static void nc_read_resources(device_t dev)
if (bmbound_hi > four_gig_kib)
ram_resource(dev, index++, four_gig_kib,
bmbound_hi - four_gig_kib);
/* Reserve everything between A segment and 1MB:
*
* 0xa0000 - 0xbffff: legacy VGA
* 0xc0000 - 0xfffff: RAM
*/
mmio_resource(dev, index++, (0xa0000 >> 10), (0xc0000 - 0xa0000) >> 10);
reserved_ram_resource(dev, index++, (0xc0000 >> 10),
(0x100000 - 0xc0000) >> 10);
#if CONFIG_CHROMEOS_RAMOOPS
reserved_ram_resource(dev, index++,
CONFIG_CHROMEOS_RAMOOPS_RAM_START >> 10,
CONFIG_CHROMEOS_RAMOOPS_RAM_SIZE >> 10);
#endif
}
static struct device_operations nc_ops = {