From 5d09c27138bdbb459c2619c4788fe495b405622b Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Fri, 3 Nov 2017 13:40:09 -0200 Subject: [PATCH] mx25: Select the ESDHC_A001 erratum MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When a high speed card is connected to mx25 the following error is seen: U-Boot 2017.11-rc2-00104-gb79372a (Oct 31 2017 - 11:02:22 -0200) CPU: Freescale i.MX25 rev1.2 at 399 MHz Reset cause: POR Board: MX25PDK I2C: ready DRAM: 64 MiB No arch specific invalidate_icache_all available! MMC: FSL_SDHC: 0 *** 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 , which prevents any usage of the SD card. 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.MX25 errata document, I have confirmed with the NXP design team that this erratum does affect i.MX25, so fix the problem by selecting SYS_FSL_ERRATUM_ESDHC_A001 at SoC level. Successfully tested with a high speed SD card on a mx25pdk board. Suggested-by: Benoît Thébaudeau Signed-off-by: Fabio Estevam Acked-by: Sebastien Bourdelin Acked-by: Otavio Salvador Tested-by: Otavio Salvador # mx25pdk --- arch/arm/mach-imx/mx2/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/mach-imx/mx2/Kconfig b/arch/arm/mach-imx/mx2/Kconfig index 5e985a6..ea308fc 100644 --- a/arch/arm/mach-imx/mx2/Kconfig +++ b/arch/arm/mach-imx/mx2/Kconfig @@ -3,6 +3,7 @@ if ARCH_MX25 config MX25 bool default y + select SYS_FSL_ERRATUM_ESDHC_A001 choice prompt "MX25 board select" optional -- 2.7.4