From: Fabio Estevam fabio.estevam@nxp.com
When a high speed card is connected to mx51evk the following error is seen:
U-Boot 2017.11-rc2 (Oct 18 2017 - 13:49:26 -0200)
CPU: Freescale i.MX51 rev3.0 at 800 MHz Reset cause: POR Board: MX51EVK DRAM: 512 MiB MMC: FSL_SDHC: 0, FSL_SDHC: 1 *** Warning - read failed, using default environment
In: serial Out: serial Err: serial Net: FEC Hit any key to stop autoboot: 0 => saveenv Saving Environment to MMC... Writing to MMC(0)... failed
The root cause for the failure is the eSDHC-A001 erratum:
"eSDHC-A001 : Data timeout counter (SYSCTL[DTOCV]) is not reliable for values of 0x4,0x8, and 0xC" that is listed on some PowerArchitecture chips: https://www.nxp.com/files-static/32bit/doc/errata/MPC8379ECE.pdf
Even though eSDHC-A001 is not documented on the i.MX51 errata document, I have confirmed with the NXP design team that this erratum does affect i.MX51, so fix the problem by selecting SYS_FSL_ERRATUM_ESDHC_A001 at SoC level.
The i.MX51 ts4800 board already selects this option, but it is better to move this selection to the i.MX51 SoC level instead.
Successfully tested with a high speed SD card on a mx51evk board.
Signed-off-by: Fabio Estevam fabio.estevam@nxp.com Acked-by: Sebastien Bourdelin sebastien.bourdelin@savoirfairelinux.com --- Changes since v2: - Put the U-Boot list on Cc.
Changes since v1: - None
arch/arm/mach-imx/mx5/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/mx5/Kconfig b/arch/arm/mach-imx/mx5/Kconfig index ef37c35..d96020d 100644 --- a/arch/arm/mach-imx/mx5/Kconfig +++ b/arch/arm/mach-imx/mx5/Kconfig @@ -6,6 +6,7 @@ config MX5
config MX51 bool + select SYS_FSL_ERRATUM_ESDHC_A001
config MX53 bool @@ -52,7 +53,6 @@ config TARGET_MX53SMD config TARGET_TS4800 bool "Support TS4800" select MX51 - select SYS_FSL_ERRATUM_ESDHC_A001
config TARGET_USBARMORY bool "Support USB armory"