For writing files, DFU implementation requires the file buffer with the len at least of file size. For big files it requires the same big buffer.
Previously the file buffer was allocated as a static variable, so it was a part of U-Boot .bss section. For 32MiB len of buffer we have 32MiB of additional space, required for this section.
The .bss needs to be cleared after the relocation. This introduces an additional boot delay at every start, but usually the dfu feature is not required at the standard boot, so the buffer should be allocated only if required.
This patch removes the static allocation of this buffer, and alloc it with memalign after first call of function: - dfu_fill_entity_mmc() and the buffer is freed on dfu_free_entity() call.
This was tested on Trats2. A quick test with trace. Boot time from start to main_loop() entry: - ~888ms - before this change (arch memset enabled for .bss clear) - ~464ms - after this change
Signed-off-by: Przemyslaw Marczak p.marczak@samsung.com Reviewed-by: Simon Glass sjg@chromium.org Cc: Lukasz Majewski l.majewski@samsung.com Cc: Stephen Warren swarren@nvidia.com Cc: Pantelis Antoniou panto@antoniou-consulting.com Cc: Tom Rini trini@ti.com Cc: Marek Vasut marek.vasut@gmail.com
--- Changes V3 - none --- drivers/dfu/dfu_mmc.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-)
diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c index 62d72fe..fd865e1 100644 --- a/drivers/dfu/dfu_mmc.c +++ b/drivers/dfu/dfu_mmc.c @@ -16,8 +16,7 @@ #include <fat.h> #include <mmc.h>
-static unsigned char __aligned(CONFIG_SYS_CACHELINE_SIZE) - dfu_file_buf[CONFIG_SYS_DFU_MAX_FILE_SIZE]; +static unsigned char *dfu_file_buf; static long dfu_file_buf_len;
static int mmc_access_part(struct dfu_entity *dfu, struct mmc *mmc, int part) @@ -211,7 +210,7 @@ int dfu_flush_medium_mmc(struct dfu_entity *dfu)
if (dfu->layout != DFU_RAW_ADDR) { /* Do stuff here. */ - ret = mmc_file_op(DFU_OP_WRITE, dfu, &dfu_file_buf, + ret = mmc_file_op(DFU_OP_WRITE, dfu, dfu_file_buf, &dfu_file_buf_len);
/* Now that we're done */ @@ -263,6 +262,14 @@ int dfu_read_medium_mmc(struct dfu_entity *dfu, u64 offset, void *buf, return ret; }
+void dfu_free_entity_mmc(struct dfu_entity *dfu) +{ + if (dfu_file_buf) { + free(dfu_file_buf); + dfu_file_buf = NULL; + } +} + /* * @param s Parameter string containing space-separated arguments: * 1st: @@ -370,6 +377,18 @@ int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s) dfu->write_medium = dfu_write_medium_mmc; dfu->flush_medium = dfu_flush_medium_mmc; dfu->inited = 0; + dfu->free_entity = dfu_free_entity_mmc; + + /* Check if file buffer is ready */ + if (!dfu_file_buf) { + dfu_file_buf = memalign(CONFIG_SYS_CACHELINE_SIZE, + CONFIG_SYS_DFU_MAX_FILE_SIZE); + if (!dfu_file_buf) { + error("Could not memalign 0x%x bytes", + CONFIG_SYS_DFU_MAX_FILE_SIZE); + return -ENOMEM; + } + }
return 0; }