tools: mkimage: Add support for initialization table for Zynq and ZynqMP

The Zynq/ZynqMP boot.bin file contains a region for register initialization
data. Filling in proper values in this table can reduce boot time
(e.g. about 50ms faster on QSPI boot) and also reduce the size of
the SPL binary.

The table is a simple text file with register+data on each line. Other
lines are simply skipped. The file can be passed to mkimage using the
"-R" parameter.

It is recommended to add reg init file to board folder.
For example:
CONFIG_BOOT_INIT_FILE="board/xilinx/zynqmp/xilinx_zynqmp_zcu102/reg.int

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/tools/zynqmpimage.c b/tools/zynqmpimage.c
index 3f28eb4..d08144c 100644
--- a/tools/zynqmpimage.c
+++ b/tools/zynqmpimage.c
@@ -234,6 +234,30 @@ static int zynqmpimage_check_image_types(uint8_t type)
 	return EXIT_FAILURE;
 }
 
+static void zynqmpimage_parse_initparams(struct zynqmp_header *zynqhdr,
+	const char *filename)
+{
+	/* Expect a table of register-value pairs, e.g. "0x12345678 0x4321" */
+	FILE *fp = fopen(filename, "r");
+	struct zynqmp_reginit reginit;
+	unsigned int reg_count = 0;
+	int r;
+
+	if (!fp) {
+		fprintf(stderr, "Cannot open initparams file: %s\n", filename);
+		exit(1);
+	}
+	do {
+		r = fscanf(fp, "%x %x", &reginit.address, &reginit.data);
+		if (r == 2) {
+			zynqhdr->register_init[reg_count] = reginit;
+			++reg_count;
+		}
+		r = fscanf(fp, "%*[^\n]\n"); /* Skip to next line */
+	} while ((r != EOF) && (reg_count < HEADER_REGINITS));
+	fclose(fp);
+}
+
 static void zynqmpimage_set_header(void *ptr, struct stat *sbuf, int ifd,
 		struct image_tool_params *params)
 {
@@ -250,6 +274,10 @@ static void zynqmpimage_set_header(void *ptr, struct stat *sbuf, int ifd,
 	if (params->eflag)
 		zynqhdr->image_load = cpu_to_le32((uint32_t)params->ep);
 
+	/* User can pass in text file with init list */
+	if (strlen(params->imagename2))
+		zynqmpimage_parse_initparams(zynqhdr, params->imagename2);
+
 	zynqhdr->checksum = zynqmpimage_checksum(zynqhdr);
 }