When we copy code/data to the main memory, we may need to flush the
cache if required by architecture. It uses the existing function
flush_cache. Syntax is

flush <addr> <size>

The addr and size are given in hexadecimal. Like memory command, there is
no sanity check for the parameters.

Signed-off-by: York Sun <york...@freescale.com>
---
Change since v2: rename flush_cache to flush

 README             |    5 ++++-
 common/cmd_cache.c |   26 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/README b/README
index dc6b0b3..b2f80d6 100644
--- a/README
+++ b/README
@@ -809,6 +809,7 @@ The following options need to be configured:
                CONFIG_CMD_BSP          * Board specific commands
                CONFIG_CMD_BOOTD          bootd
                CONFIG_CMD_CACHE        * icache, dcache
+               CONFIG_CMD_CACHE_FLUSH  * flush cache by the address and range
                CONFIG_CMD_CONSOLE        coninfo
                CONFIG_CMD_CRC32        * crc32
                CONFIG_CMD_DATE         * support for RTC, date/time...
@@ -912,7 +913,9 @@ The following options need to be configured:
                8260 (where accesses to the IMMR region must be
                uncached), and it cannot be disabled on all other
                systems where we (mis-) use the data cache to hold an
-               initial stack and some data.
+               initial stack and some data. The CONFIG_CMD_CACHE_FLUSH
+               macro enables flushing cache by the address and range to
+               maintain coherency if required by architecture.
 
 
                XXX - this list needs to get updated!
diff --git a/common/cmd_cache.c b/common/cmd_cache.c
index 5512f92..c228e0c 100644
--- a/common/cmd_cache.c
+++ b/common/cmd_cache.c
@@ -120,3 +120,29 @@ U_BOOT_CMD(
        "[on, off, flush]\n"
        "    - enable, disable, or flush data (writethrough) cache"
 );
+
+#ifdef CONFIG_CMD_CACHE_FLUSH
+int do_flush_cache(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+       ulong addr, size;
+
+       switch (argc) {
+       case 3:
+               addr = simple_strtoul(argv[1], NULL, 16);
+               size = simple_strtoul(argv[2], NULL, 16);
+               flush_cache(addr, size);
+               break;
+       default:
+               return cmd_usage(cmdtp);
+       }
+       return 0;
+
+}
+
+U_BOOT_CMD(
+       flush,   3,   0,     do_flush_cache,
+       "flush cache for a range",
+       "<addr> <size>\n"
+       "    - flush cache for specificed range"
+);
+#endif
-- 
1.7.9.5


_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot

Reply via email to