x86: Emit port 80 post codes in show_boot_progress()

[karo-tx-uboot.git] / README

diff --git a/README b/README
index ed7d270adb764ebacc115fc872f0e6228fc43abc..c7aab18efade64faffe29066ad25b0d79794cbe0 100644 (file)
--- a/README
+++ b/README
@@ -2200,6 +2200,14 @@ CBFS (Coreboot Filesystem) support
                        HERMES, IP860, RPXlite, LWMON,
                        FLAGADM, TQM8260
 
+- Access to physical memory region (> 4GB)
+               Some basic support is provided for operations on memory not
+               normally accessible to U-Boot - e.g. some architectures
+               support access to more than 4GB of memory on 32-bit
+               machines using physical address extension or similar.
+               Define CONFIG_PHYSMEM to access this basic support, which
+               currently only supports clearing the memory.
+
 - Error Recovery:
                CONFIG_PANIC_HANG