Layerscape中的主题 Re: LS1088ardb eMMC enabling

LS1088ardb eMMC enabling

zeroqruel — Wed, 07 May 2025 17:15:10 GMT

Hello experts,

I have a custom board with ls1088ardb processor. The only difference from the reference design is that I have 128GB eMMC storage instead of 4GB eMMC. I successfully boot u-boot from SD Card or QSPI. After the kernel is up, I want to use the eMMC volume as storage/database. But the eMMC volume is not loaded while loading the kernel.

The error I get is: /dev/mmcblk0p1: Can't open blockdev

Do I need to add/edit anything in dts to use eMMC volume as storage/database in userspace? Or do I need to do anything in rcw files?

My dts is like;

&esdhc {
status = "okay";
non-removable;
compatible = "fsl,ls1088a-esdhc", "fsl,esdhc";
bus-width = <4>;
};

Re: LS1088ardb eMMC enabling

Oswalag — Wed, 14 May 2025 18:05:22 GMT

Hello,

If you take a look on the LS1088ARDB, there is a mux to select if the SDHC interface is active with the SD card OR the emmc, but you can't use both at the same time due to voltage and pins restrictions.

Please refer to the description in Page 46 of the RM: Some special features of the SDHC interface are:

Regards.

Re: LS1088ardb eMMC enabling

zeroqruel — Thu, 15 May 2025 13:55:51 GMT

Hello @Oswalag

Thank you for reply. I set u-boot to open via SD or NOR(QSPI) according to rcw configuration with switch. When u-boot opens via NOR, eMMC mux is activated by CPLD. I have successfully activated eMMC but it is started as 4 buses every time. I get pinstate error while opening u-boot.

MMC: esdhc_change_pinstate 0 error esdhc_set_timing error -22 => mmcinfo esdhc_change_pinstate 4 error esdhc_set_timing error -22 Device: FSL_SDHC Manufacturer ID: 13 OEM: 14e Name: 0IM20 Bus Speed: 52000000 Mode : MMC High Speed (52MHz) Rd Block Len: 512 MMC version 5.1 High Capacity: Yes Capacity: 118.6 GiB Bus Width: 4-bit Erase Group Size: 512 KiB HC WP Group Size: 32 MiB User Capacity: 118.6 GiB WRREL Boot Capacity: 31.5 MiB ENH RPMB Capacity: 4 MiB ENH

After opening the kernel I get the error "bus width 8 failed".

dmesg | grep mmc [ 1.496588] mmc0: SDHCI controller on 2140000.esdhc [2140000.esdhc] using ADMA 64-bit [ 2.912927] mmc0: switch to bus width 8 failed [ 2.924054] mmc0: new high speed MMC card at address 0001 [ 2.925439] mmcblk0: mmc0:0001 0IM20G 119 GiB [ 2.926164] mmcblk0boot0: mmc0:0001 0IM20G partition 1 31.5 MiB [ 2.926869] mmcblk0boot1: mmc0:0001 0IM20G partition 2 31.5 MiB [ 2.927160] mmcblk0rpmb: mmc0:0001 0IM20G partition 3 4.00 MiB, chardev (508:0) [ 2.930264] mmcblk0: p1 /sys/kernel/debug/mmc0# cat ios clock: 52000000 Hz actual clock: 50000000 Hz vdd: 21 (3.3 ~ 3.4 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 2 (4 bits) timing spec: 1 (mmc high-speed) signal voltage: 0 (3.30 V) driver type: 0 (driver type B)

My definitions for emmc in dts and dtsi files are as follows;

dts; &esdhc { status = "okay"; compatible = "fsl,ls1088a-esdhc", "fsl,esdhc"; non-removable; bus-width = <8>; }; dtsi; (changed bus width to 8) esdhc: esdhc@2140000 { compatible = "fsl,ls1088a-esdhc", "fsl,esdhc"; reg = <0x0 0x2140000 0x0 0x10000>; interrupts = <0 28 0x4>; /* Level high type */ clock-frequency = <0>; voltage-ranges = <1800 1800 3300 3300>; sdhci,auto-cmd12; little-endian; bus-width = <8>; status = "okay"; };

I want to run emmc as 8 bus width. I have seen parameters like pinctrl-names, pinctrl-0, vmmc-supply, mmc-hs200-1_8v but I always got a compilation error in a few dts attempts. Especially when I defined "mmc-hs200-1_8v", I saw that emmc was not loaded in the kernel at all and I got an error. Are there any parameters that I definitely need to add among these parameters? Can you give an example? What is the reason why emmc does not work with 8 bus width? Are there any parts that you see as missing or incorrect?

Note: I added the picture of the processor's SD, eMMC and CPLD connections.

Re: LS1088ardb eMMC enabling

zeroqruel — Tue, 20 May 2025 11:43:25 GMT

I have been waiting for an answer for a long time. Can you support me? It's urgent.

@Oswalag or @yipingwang

Re: LS1088ardb eMMC enabling

zeroqruel — Fri, 23 May 2025 05:12:50 GMT

I solved the problem. In the RCW file, it was necessary to activate the function for emmc from the SPI_PCS pin settings.

SPI_PCS_BASE=2