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
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