blkmap: add an attribute to preserve the mem mapping
Some blkmap memory mapped devices might have to be relevant even
after U-Boot passes control to the next image as part of the platform
boot. An example of such a mapping would be an OS installer ISO image,
information for which has to be provided to the OS kernel. Use the
'preserve' attribute for such mappings. The code for adding a pmem
node to the device-tree then checks if this attribute is set, and adds
a node only for mappings which have this attribute.
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/include/blkmap.h b/include/blkmap.h
index d530954..754d867 100644
--- a/include/blkmap.h
+++ b/include/blkmap.h
@@ -60,10 +60,12 @@
* @blknr: Start block number of the mapping
* @blkcnt: Number of blocks to map
* @paddr: The target physical memory address of the mapping
+ * @preserve: Mapping intended to be preserved for subsequent stages,
+ * like the OS (e.g. ISO installer)
* Returns: 0 on success, negative error code on failure
*/
int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
- phys_addr_t paddr);
+ phys_addr_t paddr, bool preserve);
/**
* blkmap_from_label() - Find blkmap from label