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@ffe05000: 0, mmc@ffe07000: 1 In: serial Out: serial Err: serial Net: eth0: ethernet@ff3f0000 Hit any key to stop autoboot: 0 Odroid N2> Odroid N2> Odroid N2> Odroid N2> Odroid N2> Odroid N2> mmcinfo Device: sd@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 ?
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.
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.
Thanks for the patches & reports !
Neil
Best Regards, Jaehoon Chung