Skip to contentSkip to conversation

arm, imx6: add support for SD/MMC Manufacture Mode

PATCH Superseded Jay Carlson 2 participants 2 messages May 24, 2018 – May 25, 2018

Subsystems (3)
Arm (32-bit) Arm sub-architectures Arm i.MX and Layerscape

v1 of 2 Superseded Latest is v2 →

lore
Share & tools
lore

Jay Carlson

author
#0 lore raw

PATCH 1/1 arm, imx6: add support for SD/MMC Manufacture Mode

From: Jay Carlson <[email protected]>

This patch adds support for booting blank i.MX6 devices in SD/MMC Manufacture Mode: a fallback mode which the boot ROM enters when no fuses or boot mode pins have been set, the USB serial downloader connection is inactive, and there is an SD card inserted into uSDHC1. The i.MX7 and i.MX8, which both have a Boot_SW_Info data structure which can be parsed to determine boot source, is unaffected by this patch.

---
 arch/arm/mach-imx/spl.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
arch/arm/mach-imx/spl.c +10 -0
index a20b30d154..8ecae8605c 100644
@@ -43,6 +43,16 @@ u32 spl_boot_device(void)
 	 */
 	if (is_usbotg_phy_active())
 		return BOOT_DEVICE_BOARD;
+	
+	/**
+	 * To support SD/MMC Manufacture Mode, we check that BOOT_MODE == 0
+	 * and that BT_FUSE_SEL == 0. If this was disabled via
+	 * blowing DISABLE_SDMMC_MFG, or if SDMMC MFG mode failed,
+	 * we would be in USB download mode, which the previous line would 
+	 * have detected.
+	 */
+	if (((bmode >> 24) & 0x03) == 0x00 && (bmode >> 4) == 0x00)
+		return BOOT_DEVICE_MMC1;
 
 	/* BOOT_CFG1[7:4] - see IMX6DQRM Table 8-8 */
 	switch ((reg & IMX6_BMODE_MASK) >> IMX6_BMODE_SHIFT) {
Signature · 1 line
2.16.1.windows.4
#1 lore raw

PATCH 1/1 arm, imx6: add support for SD/MMC Manufacture Mode

Quoted 3 lines · Jay Carlson

From: Jay Carlson <[email protected]>

This patch adds support for booting blank i.MX6 devices in SD/MMC Manufacture Mode: a fallback mode which the boot ROM enters when no fuses or boot mode pins have been set, the USB serial downloader connection is inactive, and there is an SD card inserted into uSDHC1. The i.MX7 and i.MX8, which both have a Boot_SW_Info data structure which can be parsed to determine boot source, is unaffected by this patch.

Please wrap lines in 80 cols and add the missing signed-off-by.

Signature · 3 lines
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://code.ossystems.com.br
Mobile: +55 (53) 9 9981-7854          Mobile: +1 (347) 903-9750