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nb/intel/gm45: Remove UMA alignment optimization 

This code path was only triggered in one corner case: GFX UMA set to
48MiB. It created a hole below UMA to save MTRRs. But, this hole was
never accounted for when calculating cbmem_top(). Instead of trying
to fix it, remove it, it's not worth the trouble.

TEST=Booted lenovo/x200 with all available CMOS gfx_uma_size settings.

Change-Id: I3f4ceec4224d86113be9bfa3ce4759bed584640d
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/21847
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Nico Huber 2017-10-02 20:07:53 +02:00
parent 29922a5409
commit ca3e121607
2 changed files with 3 additions and 11 deletions
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10
src/northbridge/intel/gm45/northbridge.c
View File

@ -71,7 +71,7 @@ static int decode_pcie_bar(u32 *const base, u32 *const len)
static void mch_domain_read_resources(device_t dev)
{
u64 tom, touud;
u32 tomk, tolud, uma_sizek = 0, usable_tomk;
u32 tomk, tolud, uma_sizek = 0;
u32 pcie_config_base, pcie_config_size;
/* Total Memory 2GB example:
@ -130,16 +130,12 @@ static void mch_domain_read_resources(device_t dev)
uma_sizek = gms_sizek + gsm_sizek;
}
usable_tomk = ALIGN_DOWN(tomk, 64 << 10);
if (tomk - usable_tomk > (16 << 10))
usable_tomk = tomk;
printk(BIOS_INFO, "Available memory below 4GB: %uM\n", usable_tomk >> 10);
printk(BIOS_INFO, "Available memory below 4GB: %uM\n", tomk >> 10);
/* Report the memory regions */
ram_resource(dev, 3, 0, legacy_hole_base_k);
ram_resource(dev, 4, legacy_hole_base_k + legacy_hole_size_k,
(usable_tomk - (legacy_hole_base_k + legacy_hole_size_k)));
(tomk - (legacy_hole_base_k + legacy_hole_size_k)));
/*
* If >= 4GB installed then memory from TOLUD to 4GB

4
src/northbridge/intel/gm45/raminit.c
View File

@ -1241,10 +1241,6 @@ static void program_memory_map(const dimminfo_t *const dimms, const channel_mode
printk(BIOS_DEBUG, " and %uM GTT\n", gsm_sizek >> 10);
uma_sizem = (gms_sizek + gsm_sizek) >> 10;
/* Further reduce MTRR usage if it costs use less than
16 MiB. */
if (ALIGN_UP(uma_sizem, 64) - uma_sizem <= 16)
uma_sizem = ALIGN_UP(uma_sizem, 64);
}
}