MMC - Revision history

Savoundg at 21:01, 7 October 2017

2017-10-07T21:01:57Z

← Older revision		Revision as of 21:01, 7 October 2017
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	=== How to ~~boot from the~~ eMMC boot partition?<ref>~~https~~:/~~/kernel.googlesource.com/pub/scm~~/linux~~/kernel/git/cjb/mmc~~-~~utils~~/~~+/7bd1320b2cb38f040ab5cf017d17e283496690bf~~</ref><~~ref~~>~~https:~~//~~community.nxp.com~~/~~thread~~/~~312758~~</~~ref~~> ~~===~~		=== How to disable eMMC boot partition write protection?<ref>http://linux-sunxi.org/Bootable_eMMC</ref> ===
			<syntaxhighlight lang="bash">
			echo 0 > /sys/block/mmcblk1boot1/force_ro
			</syntaxhighlight>

	<~~nowiki~~>#</~~nowiki~~> ~~echo 0~~ > /~~sys~~/~~block~~/~~mmcblk1boot1~~/~~force_ro~~		=== How to boot from the eMMC boot partition?<ref>https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf</ref><ref>https://community.nxp.com/thread/312758</ref><ref>https://github.com/SanDisk-Open-Source/wireless-media-drive/blob/master/linux-2.6.35.3/patches/0121-ENGR00126228-eMMC-Configure-boot_partition_enable.patch</ref><ref>https://www.renesas.com/en-us/doc/products/mpumcu/apn/rz/r01an1977ej0081-rza1h.pdf</ref> ===

	~~ext csd~~		The latest eMMC version contains specific boot partitions. In order to boot from it, it should be configured properly.

	BOOT_BUS_WIDTH[177]		The Extended CSD register (EXT_CSD) has fields related to the boot partition configuration:
			* BOOT_BUS_WIDTH[177] (8-bit)
	PARTITION_CONFIG (~~before~~ BOOT_CONFIG)[~~179~~]		** BOOT_BUS_WIDTH[1:0]=0b01 (Sets the bus width to 4 bits during the boot operation.)
			* PARTITION_CONFIG[179]=0x48 (8-bit) (formerly BOOT_CONFIG[179])
			** bit 7: reserved
			** BOOT_ACK[6]=0b1 (enable)
			** BOOT_PARTITION_ENABLE[5:3]=0b001 (Boot partition 1 enabled)
			** PARTITION_ACCESS[2:0]=0b000 (No access to boot partition)

	== Resources ==		== Resources ==

Savoundg at 20:42, 7 October 2017

2017-10-07T20:42:41Z

← Older revision		Revision as of 20:42, 7 October 2017
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	!		!
	\|-		\|-
	\|		\|JESD84-A44 - JEDEC
	\|http://rere.qmqm.pl/~mirq/JESD84-A44.pdf		\|http://rere.qmqm.pl/~mirq/JESD84-A44.pdf
			\|-
			\|eMMC v4.41 and v4.5 Architecture
			\|https://www.jedec.org/sites/default/files/Victo_Tsai(1).pdf
	\|}		\|}

	== References ==		== References ==

Savoundg at 20:40, 7 October 2017

2017-10-07T20:40:37Z

← Older revision		Revision as of 20:40, 7 October 2017
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			=== How to boot from the eMMC boot partition?<ref>https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf</ref><ref>https://community.nxp.com/thread/312758</ref> ===
	https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf

	<nowiki>#</nowiki> echo 0 > /sys/block/mmcblk1boot1/force_ro		<nowiki>#</nowiki> echo 0 > /sys/block/mmcblk1boot1/force_ro

	ext csd		ext csd

	~~PARTITION_CONFIG (formerly BOOT_CONFIG)~~

	~~http://rere.qmqm.pl/~mirq/JESD84-A44.pdf~~

	BOOT_BUS_WIDTH[177]		BOOT_BUS_WIDTH[177]
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	\|-		\|-
	\|		\|
	\|~~https~~://~~community~~.~~nxp~~.~~com~~/~~thread~~/~~312758~~		\|http://rere.qmqm.pl/~mirq/JESD84-A44.pdf
	\|-
	\|
	\|
	\|-
	\|
	\|
	\|}		\|}

			== References ==

Savoundg at 20:37, 7 October 2017

2017-10-07T20:37:05Z

@@ Line 1: / Line 1: @@
 https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf
@@ Line 13: / Line 14: @@
 PARTITION_CONFIG (before BOOT_CONFIG)[179]
-https://community.nxp.com/thread/312758
+== Resources ==

Savoundg at 22:47, 24 August 2016

2016-08-24T22:47:32Z

← Older revision		Revision as of 22:47, 24 August 2016
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	http://rere.qmqm.pl/~mirq/JESD84-A44.pdf		http://rere.qmqm.pl/~mirq/JESD84-A44.pdf

			BOOT_BUS_WIDTH[177]

			PARTITION_CONFIG (before BOOT_CONFIG)[179]

			https://community.nxp.com/thread/312758

Savoundg at 22:36, 24 August 2016

2016-08-24T22:36:26Z

← Older revision		Revision as of 22:36, 24 August 2016
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	<nowiki>#</nowiki> echo 0 > /sys/block/mmcblk1boot1/force_ro		<nowiki>#</nowiki> echo 0 > /sys/block/mmcblk1boot1/force_ro

			ext csd

			PARTITION_CONFIG (formerly BOOT_CONFIG)

			http://rere.qmqm.pl/~mirq/JESD84-A44.pdf

Savoundg at 23:38, 23 August 2016

2016-08-23T23:38:07Z

← Older revision		Revision as of 23:38, 23 August 2016
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	https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf		https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf

			<nowiki>#</nowiki> echo 0 > /sys/block/mmcblk1boot1/force_ro

Savoundg: Created page with "https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf"

2016-08-23T23:24:46Z

Created page with "https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf"

New page

https://kernel.googlesource.com/pub/scm/linux/kernel/git/cjb/mmc-utils/+/7bd1320b2cb38f040ab5cf017d17e283496690bf