[U-Boot] [PATCH 06/10][v2] driver/mtd/spi:Read 8KB data chunk during u-boot load in SPL

[Prabhakar Kushwaha]

SPI driver perform its operation(read/write) on 64KB buffer chunk for data
greater than 64KB. This buffer chunk is allocated from system heap.

During SPL boot, 768KB of data is read from SPI flash.
Here, heap size may not be sufficient enough to full-fill 64KB buffer
requirement of SPI driver. So break down u-boot read operation at 8KB of chunk.

Also, fix a warning i.e. "unused variable buf" during CONFIG_FSL_CORENET

Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
---
 Please note currently SPI boot is taking 20sec time. Fix will be sent
 separately to fix it.

 Changes for v2: Sending as it is.

 drivers/mtd/spi/fsl_espi_spl.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/spi/fsl_espi_spl.c b/drivers/mtd/spi/fsl_espi_spl.c
index e5ac79b..a55d741 100644
--- a/drivers/mtd/spi/fsl_espi_spl.c
+++ b/drivers/mtd/spi/fsl_espi_spl.c
@@ -20,8 +20,10 @@
 void spi_boot(void)
 {
 	void (*uboot)(void) __noreturn;
-	u32 offset, code_len;
+	u32 offset, code_len, copy_len = 0;
+#ifndef CONFIG_FSL_CORENET
 	unsigned char *buf = NULL;
+#endif
 	struct spi_flash *flash;
 
 	flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
@@ -56,8 +58,15 @@ void spi_boot(void)
 	code_len = code_len - CONFIG_SPL_MAX_SIZE;
 #endif
 	/* copy code to DDR */
-	spi_flash_read(flash, offset, code_len,
-		       (void *)CONFIG_SYS_SPI_FLASH_U_BOOT_DST);
+	printf("Loading second stage boot loader ");
+	while (copy_len <= code_len) {
+		spi_flash_read(flash, offset + copy_len, 0x2000,
+			       (void *)(CONFIG_SYS_SPI_FLASH_U_BOOT_DST
+			       + copy_len));
+		copy_len = copy_len + 0x2000;
+		putc('.');
+	}
+
 	/*
 	* Jump to U-Boot image
 	*/
-- 
1.7.9.5