From 18c40eb9e53f559e089b6f745284cf42718182da Mon Sep 17 00:00:00 2001 From: Hsiangkai Wang Date: Thu, 11 Jul 2013 10:08:15 +0800 Subject: [PATCH] nds32: Use DMA to access memory as no DCache As GDB uses file-I/O protocol to access memory, use DMA to access if no DCache. This commit improves the performance of Andes Virtual Hosting. Change-Id: I36bb2154b9f497fc4237625836cf8c7115330a60 Signed-off-by: Hsiangkai Wang Reviewed-on: http://openocd.zylin.com/1580 Tested-by: jenkins Reviewed-by: Spencer Oliver --- src/target/nds32_v3_common.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/src/target/nds32_v3_common.c b/src/target/nds32_v3_common.c index e88430f2b..e01025f26 100644 --- a/src/target/nds32_v3_common.c +++ b/src/target/nds32_v3_common.c @@ -555,19 +555,25 @@ int nds32_v3_write_buffer(struct target *target, uint32_t address, return ERROR_FAIL; if (nds32->hit_syscall) { - /* Use bus mode to access memory during virtual hosting */ struct aice_port_s *aice = target_to_aice(target); enum nds_memory_access origin_access_channel; - int result; - origin_access_channel = memory->access_channel; - memory->access_channel = NDS_MEMORY_ACC_BUS; - aice_memory_access(aice, NDS_MEMORY_ACC_BUS); + /* If target has no cache, use BUS mode to access memory. */ + if ((memory->dcache.line_size == 0) + || (memory->dcache.enable == false)) { + /* There is no Dcache or Dcache is disabled. */ + memory->access_channel = NDS_MEMORY_ACC_BUS; + aice_memory_access(aice, NDS_MEMORY_ACC_BUS); + } + + int result; result = nds32_gdb_fileio_write_memory(nds32, address, size, buffer); - memory->access_channel = origin_access_channel; - aice_memory_access(aice, origin_access_channel); + if (NDS_MEMORY_ACC_CPU == origin_access_channel) { + memory->access_channel = NDS_MEMORY_ACC_CPU; + aice_memory_access(aice, NDS_MEMORY_ACC_CPU); + } return result; }