@@ -24,6 +24,8 @@ SPEAr
- ST SPEAr platform Linux Overview
VFP/
- Release notes for Linux Kernel Vector Floating Point support code
+early_ioremap.txt
+ - documentation of the early_ioremap() functionality
empeg/
- Ltd's Empeg MP3 Car Audio Player
mem_alignment
new file mode 100644
@@ -0,0 +1,23 @@
+early_ioremap()/early_memremap() and early_iounmap() provide a mechanism for
+temporarily mapping in small blocks of memory, identified by their physical
+address, into the fixmap virtual address block before paging_init() has run
+and more flexible mapping functions are available.
+
+Due to its direct method, it also gets around potential need for special
+handling of regions that end up in highmem.
+
+It supports up to 7 simultaneously mapped regions of up to 128KB each.
+All mappings created by early_ioremap() are non-shareable device memory.
+All mappings created by early_memremap() are uncached normal memory.
+
+Any residual mappings will be overridden by subsequent kmap() calls (but do
+use early_iounmap()).
+
+Specify 'early_ioremap_debug' on the kernel commandline for verbose output.
+
+SYNOPSIS
+ #include <asm/io.h>
+
+ void *early_ioremap(resource_size_t phys_addr, unsigned long size);
+ void *early_memremap(resource_size_t phys_addr, unsigned long size);
+ void early_iounmap(void *addr, unsigned long size);