Hi,
On Tue, Jun 7, 2016 at 2:09 PM, vinoth eswaran evinoth1206@gmail.com wrote:
Hello Mr.Bin,
Please keep the ML in the loop, also avoid top-posting, and always use plain text.
I have attached the start up logs for your reference, I have added some debug messages also and I have disabled the SDIO (0f15) by removing it from u-boot , so please ignore that.
bootcmd=fatload mmc 0:1 01000000 bzImage; zboot 01000000
I am not passing any commnd line from u-boot.
Since I have builded a customised Linux kernel I have the command line added in one of the .scc files.
Kernel command line: root=/dev/mmcblk0p2 rootwait rootfstype=ext4 console=ttyS0,115200 console=tty0
My View:
By UEFI SDHCI is on ACPI
mmc0: SDHCI controller on ACPI [80860F16:00] using ADMA
and by u-boot SDHCI is on PCI
mmc0: SDHCI controller on PCI [0000:00:12.0] using ADMA
and I think that something is missing in U-boot or Linux , so it is unable to initialize SD card. It will be great , if u give me some inputs to fix this issue.
Just some initial investigation based on your log. It looks Linux kernel prints:
[ 1.267312] sdhci-pci 0000:00:12.0: failed to setup card detect gpio
where it calls mmc_gpiod_request_cd() in drivers/mmc/host/sdhci-pci-core.c:
mmc_gpiod_request_cd(host->mmc, slot->cd_con_id, slot->cd_idx, slot->cd_override_level, 0, NULL)) { dev_warn(&pdev->dev, "failed to setup card detect gpio\n"); slot->cd_idx = -1; }
I did not have time to debug this, but based on the API name it looks to me this mmc_gpiod_request_cd() has something to do with GPIO where the Linux SDHC driver requests a card detect signal from a GPIO pin.
On BayTrail, GPIO driver in Linux only works with ACPI as it cannot be discovered via PCI, so U-Boot must ship with an ACPI table, which is already supported in the latest mainline. Please do the same testing with the latest U-Boot to see if the problem still exists.
Regards, Bin