Re: [U-Boot] [RFC PATCH] mmc: Skipping the MMC initialization at the boot time

On 01/18/2018 02:40 PM, Siva Durga Prasad Paladugu wrote:

From: Vipul Kumar vipul.kumar@xilinx.com

By enabling CONFIG_SKIP_EARLY_MMC_INIT config, user can skip the MMC initialization at the boot time. After getting the u-boot console, user can select the device using mmc dev and can communicate with that. This is useful where user don't want to perform mmc initialization while booting and can do explicitly later as per choice.

Is there any use-case? What benefit can user have with this config? According to commit-msg, user will choose the mmc device later. Is it same with initializing at booting time?

Signed-off-by: Vipul Kumar vipulk@xilinx.com Signed-off-by: Siva Durga Prasad Paladugu sivadur@xilinx.com

---

common/board_r.c | 4 ++-- drivers/mmc/Kconfig | 7 +++++++ 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/common/board_r.c b/common/board_r.c index 2a9df6b..8727b93 100644 --- a/common/board_r.c +++ b/common/board_r.c @@ -421,7 +421,7 @@ static int initr_onenand(void) } #endif

-#ifdef CONFIG_MMC +#if defined(CONFIG_MMC) && !defined(CONFIG_SKIP_EARLY_MMC_INIT) static int initr_mmc(void) { puts("MMC: "); @@ -768,7 +768,7 @@ static init_fnc_t init_sequence_r[] = { #ifdef CONFIG_CMD_ONENAND initr_onenand, #endif -#ifdef CONFIG_MMC +#if defined(CONFIG_MMC) && !defined(CONFIG_SKIP_EARLY_MMC_INIT) initr_mmc, #endif initr_env, diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index ab0627a..05b1503 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -40,6 +40,13 @@ config SPL_DM_MMC

if MMC

+config SKIP_EARLY_MMC_INIT

•   bool "Skip the MMC initialization at boot time"
  

•   help
  

•     Skip the MMC initialization at the boot time. After getting the u-boot
  

•     console, user need to set mmc device and after setting the mmc dev, user
  

•     can communicate with that device.
  

config ARM_PL180_MMCI bool "ARM AMBA Multimedia Card Interface and compatible support" depends on DM_MMC && OF_CONTROL -- 2.7.4

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