[Bug 1920] New: sparc64: memory mapping fixes
bugzilla-daemon at rtems.org
bugzilla-daemon at rtems.org
Tue Sep 20 17:08:21 UTC 2011
https://www.rtems.org/bugzilla/show_bug.cgi?id=1920
Summary: sparc64: memory mapping fixes
Product: RTEMS
Version: HEAD
Platform: sparc64
OS/Version: RTEMS
Status: NEW
Severity: normal
Priority: P3
Component: bsps
AssignedTo: joel.sherrill at oarcorp.com
ReportedBy: giddyup44 at yahoo.com
Created attachment 1337
--> https://www.rtems.org/bugzilla/attachment.cgi?id=1337
Fix BSP to support more than 4 MB of RAM.
This patch fixes BSP memory to support more than 4 MB of RAM. We manually
install (identity) TLB mappings and do not support MMU traps. In the future I
would look to refactor the manual entries into a more generic trap-based
solution. This patch installs enough mappings for 12MB of RAM and makes
adjustments to the linkcmds to reflect what is available. A fix is made to
install the TLB mappings before the stack is accessed so that if it is located
at a high address it will be mapped. This patch also corrects the layout of
memory so that the workspace does not overlap with the heap.
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