Fail to reset on Odroid-C4

[Jaehoon Chung]

Hi,

On 11/6/20 6:28 PM, Neil Armstrong wrote:
> Hi,
> 
> On 06/11/2020 03:10, Jaehoon Chung wrote:
>> Hi,
>>
>> I have checked U-boot on Odroid-C4 with v2020.10.
>> I found a problem about reset behavior.
>>
>> In my environment,
>> - Boot to SD-card,
>> - built u-boot v2020.10 with ordoid-c4_defconfig
>> - Referred to doc/board/amlogic/odroid-c4.rst
>>
>>
>> If do "reset" command after run command "mmcinfo", it didn't work anymore.
>> - After something to do operation relevant to MMC. (read/write or ls mmc, etc..)
>>
>>
>> U-Boot 2020.10-00383-g2f27fb20151b-dirty (Nov 06 2020 - 10:37:09 +0900) odroid-c4
>>
>> Model: Hardkernel ODROID-C4
>> SoC:   Amlogic Meson SM1 (Unknown) Revision 2b:c (10:2)
>> DRAM:  3.8 GiB
>> MMC:   sd at ffe05000: 0, mmc at ffe07000: 1
>> In:    serial
>> Out:   serial
>> Err:   serial
>> Net:   eth0: ethernet at ff3f0000
>> Hit any key to stop autoboot:  0
>> Odroid N2>
>> Odroid N2>
>> Odroid N2>
>> Odroid N2>
>> Odroid N2>
>> Odroid N2> mmcinfo
>> Device: sd at ffe05000
>> Manufacturer ID: 3
>> OEM: 5344
>> Name: SB16G
>> Bus Speed: 50000000
>> Mode: SD High Speed (50MHz)
>> Rd Block Len: 512
>> SD version 3.0
>> High Capacity: Yes
>> Capacity: 14.8 GiB
>> Bus Width: 4-bit
>> Erase Group Size: 512 Bytes
>> Odroid N2> reset
>> resetting ...
>> bl31 reboot reason: 0xd
>> bl31 reboot reason: 0x0
>> system cmd  1.
>> SM1:BL:511f6b:81ca2f;FEAT:A0F83180:20282000;POC:F;RCY:0;EMMC:800;NAND:81;SD?:0;SD:0;READ:0;0.0;CHK:0;
>> bl2_stage_init 0x01
>> bl2_stage_init 0x81
>> hw id:?M1:BL:511f6b:81ca2f;FEAT:A0F83180:20282000;POC:F;RCY:0;EMMC:800;NAND:81;SD?:0;SD:800;USB:8;
> 
> It's a new one !
> 
>>
>>
>> I didn't analyze it in more detail. I will do. But it seems that relevant to BL2 binary.
>> If nothing to do before reset, it's working fine.
> 
> Is this the same with SDCard ?

Yes. I had tested with same SD-card. (I can't test with eMMC, because eMMC doesn't initialize.)

1) After boot, reset -> fine
2) After boot, run some mmc operation -> reset -> fail.


> 
> The SDCard & eMMC regulators doesn't reset to default when resetting, causing issues
> with the boot ROM... maybe you'll need to reset the regulators in a reset for the
> Odroid C4 board.

Actually, i hope that it works fine after building mainline u-boot with odroid-c4_defconfig.
Because it seems that supports Odroid-c4. But it doesn't work well. :(

For checking, i'm using with u-boot-amlogic with 2021.01-rc1

But eMMC doesn't work..
I'm analyzing this problem..it doesn't work higher mode than 26MHz speed mode.
How did you check for eMMC card? I will fix it but i don't have any information about meson_gx_mmc.

If i find how to fix it, i will send patch.


> 
>>
>> If someone already fixed this or I missed something to do, let me know, plz.
> 
> AFAIK no, I just pushed a fix for the eMMC/SDCard clock causing read issues at 50MHz.

Is it relevant to IO error (-5)?


Best Regards,
Jaehoon Chung

> 
> Thanks for the patches & reports !
> 
> Neil
> 
>>
>> Best Regards,
>> Jaehoon Chung
>>
> 
>