diff options
| author | Patrick Georgi <pgeorgi@chromium.org> | 2016-04-13 21:00:12 +0200 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-04-16 01:50:55 +0200 |
| commit | 59493717ad7aee5e4d6179b00c66b21af79e0376 (patch) | |
| tree | d3c9c27408c0499e4876fe366d695e6ecdec4842 /src/northbridge/amd | |
| parent | fab8ae77cb1a0fc078a4ddced50b3d30dec1df85 (diff) | |
northbridge/amd/{lx,gx2}: remove immediate accesses of 0
gcc doesn't like these because they're undefined behavior, so use
zeroptr instead. For the loop that just does a number of writes (0..4),
use zeroptr + i.
Checked the disassembly (AMD_RUMBA and PCENGINES_ALIX2D) to not contain
ud2 anymore and to look reasonable where zeroptr was used.
Change-Id: I4a58220ec9a10c465909ca4ecbe5366d0a8cc0df
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/14345
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/northbridge/amd')
| -rw-r--r-- | src/northbridge/amd/gx2/northbridgeinit.c | 2 | ||||
| -rw-r--r-- | src/northbridge/amd/gx2/raminit.c | 5 | ||||
| -rw-r--r-- | src/northbridge/amd/lx/northbridgeinit.c | 2 | ||||
| -rw-r--r-- | src/northbridge/amd/lx/raminit.c | 5 |
4 files changed, 6 insertions, 8 deletions
diff --git a/src/northbridge/amd/gx2/northbridgeinit.c b/src/northbridge/amd/gx2/northbridgeinit.c index 319d95a8ef..348cdb941c 100644 --- a/src/northbridge/amd/gx2/northbridgeinit.c +++ b/src/northbridge/amd/gx2/northbridgeinit.c @@ -656,7 +656,7 @@ void northbridge_init_early(void) /* Now that the descriptor to memory is set up. */ /* The memory controller needs one read to synch its lines before it can be used. */ - i = *(volatile int *) 0; + read32(zeroptr); GeodeLinkPriority(); diff --git a/src/northbridge/amd/gx2/raminit.c b/src/northbridge/amd/gx2/raminit.c index 46ec6b8830..db10138b34 100644 --- a/src/northbridge/amd/gx2/raminit.c +++ b/src/northbridge/amd/gx2/raminit.c @@ -16,6 +16,7 @@ #include <cpu/amd/gx2def.h> #include <spd.h> +#include <stddef.h> static const unsigned char NumColAddr[] = { 0x00, 0x10, 0x11, 0x00, 0x00, 0x00, 0x00, 0x07, @@ -596,10 +597,8 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl) /* The RAM dll needs a write to lock on so generate a few dummy writes */ /* Note: The descriptor needs to be enabled to point at memory */ - volatile unsigned long *ptr; for (i = 0; i < 5; i++) { - ptr = (void *)i; - *ptr = (unsigned long)i; + write32(zeroptr + i, i); } printk(BIOS_INFO, "RAM DLL lock\n"); diff --git a/src/northbridge/amd/lx/northbridgeinit.c b/src/northbridge/amd/lx/northbridgeinit.c index a07a1eacad..f385770bc7 100644 --- a/src/northbridge/amd/lx/northbridgeinit.c +++ b/src/northbridge/amd/lx/northbridgeinit.c @@ -738,7 +738,7 @@ void northbridge_init_early(void) /* Now that the descriptor to memory is set up. */ /* The memory controller needs one read to synch its lines before it can be used. */ - i = *(volatile int *)0; + read32(zeroptr); GeodeLinkPriority(); diff --git a/src/northbridge/amd/lx/raminit.c b/src/northbridge/amd/lx/raminit.c index f20aed298a..c540f9a399 100644 --- a/src/northbridge/amd/lx/raminit.c +++ b/src/northbridge/amd/lx/raminit.c @@ -18,6 +18,7 @@ #include <cpu/amd/lxdef.h> #include <arch/io.h> #include <spd.h> +#include <stddef.h> #include "southbridge/amd/cs5536/cs5536.h" #include "raminit.h" #include "northbridge.h" @@ -747,10 +748,8 @@ void sdram_enable(int controllers, const struct mem_controller *ctrl) /* The RAM dll needs a write to lock on so generate a few dummy writes */ /* Note: The descriptor needs to be enabled to point at memory */ - volatile unsigned long *ptr; for (i = 0; i < 5; i++) { - ptr = (void *)i; - *ptr = (unsigned long)i; + write32(zeroptr + i, i); } /* SWAPSiF for PBZ 4112 (Errata 34) */ /* check for failed DLL settings now that we have done a memory write. */ |