SD Card used to flash eMMC

dzhou · September 8, 2020, 12:52pm

Hi Robert,

Please help me to clear a few questions:
If SD card is used to flash eMMC for bare metal boards, what are required? Can it be done without UART and micro usb to download MLO and u-boot.img first?
How to uboot with sd card? Has any sd card image that bundles uboot and debian to be flash on to emmc at once?
Any way to program EEPROM through SD card?

Thank You,
David

RobertCNelson · September 8, 2020, 2:02pm

Hi @dzhou, factory “blank” boards can be programmed by the a special “blank” version of the flasher:

https://rcn-ee.net/rootfs/bb.org/testing/2020-04-06/buster-console/BBB-blank-debian-10.3-console-armhf-2020-04-06-1gb.img.xz

It uses a special u-boot patch to assume eeprom is is a specific board:

github.com

RobertCNelson/Bootloader-Builder/blob/master/patches/v2019.04/0003-NFM-Production-eeprom-assume-device-is-BeagleBone-Bl.patch

From 7b3b131999bb13e06fa619da580ff4575901639d Mon Sep 17 00:00:00 2001
From: Robert Nelson <robertcnelson@gmail.com>
Date: Mon, 24 Aug 2020 13:02:53 -0500
Subject: [PATCH 3/3] NFM-Production-eeprom-assume-device-is-BeagleBone-Bl

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
---
 board/ti/am335x/board.c        |  6 ++++--
 board/ti/am335x/board.h        |  7 ++++++-
 board/ti/am335x/mux.c          |  7 +++++--
 board/ti/common/board_detect.c | 12 ++++++++++++
 configs/am335x_evm_defconfig   |  3 +--
 include/configs/am335x_evm.h   | 10 ++++++++++
 6 files changed, 38 insertions(+), 7 deletions(-)

diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c
index 876fc57434..d8bb9c1861 100644
--- a/board/ti/am335x/board.c
+++ b/board/ti/am335x/board.c
@@ -707,7 +707,7 @@ const struct dpll_params *get_dpll_ddr_params(void)

This file has been truncated. show original

Which for the factory read’s /boot/.eeprom.txt to help speicfy which board:

github.com

RobertCNelson/Bootloader-Builder/blob/master/patches/v2019.04/0003-NFM-Production-eeprom-assume-device-is-BeagleBone-Bl.patch#L152-L159


+		"if test $board_name = A335BLNK; then " \
+			"if test -e mmc 0:1 /boot/.eeprom.txt; then " \
+				"load mmc 0:1 ${loadaddr} /boot/.eeprom.txt;" \
+				"env import -t ${loadaddr} ${filesize};" \
+				"echo Loaded environment from /boot/.eeprom.txt;" \
+				"run eeprom_program; " \
+			"fi;" \
+			"setenv fdtfile am335x-bonegreen.dtb; fi; " \

and then programs the matching id to the board:

github.com

RobertCNelson/Bootloader-Builder/blob/master/patches/v2019.04/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch#L661-L673


+	"eeprom_program="\
+		"if test $board_eeprom_header = bbb_blank; then " \
+			"run eeprom_dump; run eeprom_blank; run eeprom_bbb_header; run eeprom_dump; reset; fi; " \
+		"if test $board_eeprom_header = bbbl_blank; then " \
+			"run eeprom_dump; run eeprom_blank; run eeprom_bbb_header; run eeprom_bbbl_footer; run eeprom_dump; reset; fi; " \
+		"if test $board_eeprom_header = bbbw_blank; then " \
+			"run eeprom_dump; run eeprom_blank; run eeprom_bbb_header; run eeprom_bbbw_footer; run eeprom_dump; reset; fi; " \
+		"if test $board_eeprom_header = pocketbeagle_blank; then " \
+			"run eeprom_dump; run eeprom_blank; run eeprom_pocketbeagle; run eeprom_dump; reset; fi; " \
+		"if test $board_eeprom_header = bbgg_blank; then " \
+			"run eeprom_dump; run eeprom_blank; run eeprom_bbb_header; run eeprom_bbgg_footer; run eeprom_dump; reset; fi; " \
+		"if test $board_eeprom_header = beaglelogic_blank; then " \
+			"run eeprom_dump; run eeprom_blank; run eeprom_beaglelogic; run eeprom_dump; reset; fi;  \0" \

All done in U-Boot, (u-boot.img)

Regards,

dzhou · September 8, 2020, 2:05pm

Thank you,
David

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SD Card used to flash eMMC

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