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authorLuc Verhaegen <libv@skynet.be>2009-06-03 10:47:19 +0000
committerLuc Verhaegen <libv@skynet.be>2009-06-03 10:47:19 +0000
commit9ceae905f10a555835db0af072c3adfff98b3a7b (patch)
tree1ea238ee0dbf2b4c4ed206326ed4bf2457f9a018 /src/mainboard/tyan/s4882
parenta922b3195b77a3cc82bafad20dd3dfcfd2a61bc0 (diff)
downloadcoreboot-9ceae905f10a555835db0af072c3adfff98b3a7b.tar.xz
CMOS: Add set_option and rework get_option.
To ease some of my debugging pain on the unichrome, i decided i needed to move FB size selection into cmos, so i could test a size and then reset it to the default after loading this value so that the next reboot uses the (working) default again. This meant implementing set_option in parallel to get_option. get_option was then found to have inversed argument ordering (like outb) and passing char * and then depending on the cmos layout length, which made me feel quite uncomfortable. Since we either have reserved space (which we shouldn't do anything with in these two functions), an enum or a hexadecimal value, unsigned int seemed like the way to go. So all users of get_option now have their arguments inversed and switched from using ints to unsigned ints now. The way get_cmos_value was implemented forced us to not overlap byte and to have multibyte values be byte aligned. This logic is now adapted to do a full uint32_t read (when needed) at any offset and any length up to 32, and the shifting all happens inside an uint32_t as well. set_cmos_value was implemented similarly. Both routines have been extensively tested in a quick separate little program as it is not easy to get this stuff right. build_opt_tbl.c was altered to function correctly within these new parameters. The enum value retrieval has been changed strol(..., NULL, 10) to stroul(..., NULL, 0), so that we not only are able to use unsigned ints now but so that we also interprete hex values correctly. The 32bit limit gets imposed on all entries not marked reserved, an unused "user_data" field that appeared in a lot of cmos.layouts has been changed to reserved as well. Signed-off-by: Luc Verhaegen <libv@skynet.be> Acked-by: Peter Stuge <peter@stuge.se> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4332 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/mainboard/tyan/s4882')
-rw-r--r--src/mainboard/tyan/s4882/cmos.layout2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mainboard/tyan/s4882/cmos.layout b/src/mainboard/tyan/s4882/cmos.layout
index fa37d683d0..7e91aaf743 100644
--- a/src/mainboard/tyan/s4882/cmos.layout
+++ b/src/mainboard/tyan/s4882/cmos.layout
@@ -43,7 +43,7 @@ entries
440 4 e 9 slow_cpu
444 1 e 1 nmi
445 1 e 1 iommu
-728 256 h 0 user_data
+728 256 r 0 user_data
984 16 h 0 check_sum
# Reserve the extended AMD configuration registers
1000 24 r 0 reserved_memory1