Create a physical memory mapping function which requests cached readonly
memory. This should take care of picky Linux kernels which do not allow
uncached mappings to cached areas.
Handle mapping failure gracefully (no forced exit()) if the caller
specifies it.
Such cached areas which can handle mapping failure are DMI tables and
coreboot tables. On failure we just ignore those tables. That is not
perfect, but a lot better than aborting flashrom due to an error in
nonessential functionality.
This should fix flashrom on a sizable number of machines where it
currently aborts early.
Yes, I could have exploited a Linux kernel bug to "solve" this, but
relying on such bugs is not exactly the best idea.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Vincent Pelletier <plr.vincent@gmail.com>
git-svn-id: svn://coreboot.org/flashrom/trunk@889 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
diff --git a/flash.h b/flash.h
index 3d31d44..d8f02bb 100644
--- a/flash.h
+++ b/flash.h
@@ -343,6 +343,7 @@
/* physmap.c */
void *physmap(const char *descr, unsigned long phys_addr, size_t len);
+void *physmap_try_ro(const char *descr, unsigned long phys_addr, size_t len);
void physunmap(void *virt_addr, size_t len);
int setup_cpu_msr(int cpu);
void cleanup_cpu_msr(void);