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| author | Dan Williams <dan.j.williams@intel.com> | 2009-08-01 02:11:41 +0200 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-08-01 02:11:41 +0200 |
| commit | 969c255511a4bd12e6becc11b2a822f24c1fbb76 (patch) | |
| tree | 537dab66d2bd7d45adfd6f5ab69ccb77c75a01da /platform-intel.c | |
| parent | imsm: fix family number handling (diff) | |
| download | mdadm-969c255511a4bd12e6becc11b2a822f24c1fbb76.tar.xz mdadm-969c255511a4bd12e6becc11b2a822f24c1fbb76.zip | |
platform: relax rom scanning alignment for ahci platforms
The PCI-3.0 Firmware specification allows for option-roms to have
512-byte alignment rather than 2048-byte. As there does not appear to
be a reliable method to detect a PCI-3.0 compliant BIOS from userspace
we allow the imsm platform detection code to presume that a system
modern enough to have an Intel AHCI controller does not have
dangerous/legacy ISA regions in the option-ROM memory space.
An environment variable to disable this behaviour, IMSM_SAFE_OROM_SCAN,
is added in case this presumption is ever proven wrong.
Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'platform-intel.c')
| -rw-r--r-- | platform-intel.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/platform-intel.c b/platform-intel.c index 5160227b..eaf4c483 100644 --- a/platform-intel.c +++ b/platform-intel.c @@ -157,6 +157,7 @@ static int scan(const void *start, const void *end) const struct imsm_orom *find_imsm_orom(void) { static int populated = 0; + unsigned long align; /* it's static data so we only need to read it once */ if (populated) @@ -184,7 +185,11 @@ const struct imsm_orom *find_imsm_orom(void) return NULL; /* scan option-rom memory looking for an imsm signature */ - if (probe_roms_init() != 0) + if (check_env("IMSM_SAFE_OROM_SCAN")) + align = 2048; + else + align = 512; + if (probe_roms_init(align) != 0) return NULL; probe_roms(); populated = scan_adapter_roms(scan); |