Dear all,
Our customer uses eMMC5.0 device.
And they make a system boot from eMMC with Bus Width=8bit(BOOT_CFG2[7:5]=010).
In this case, system can not boot.
When Bus Width is set to 4bit(BOOT_CFG2[7:5]=001) and U-Boot is set as 4bit, system is able to boot.
However, boot speed is very slow.
Is there a way to be accessed by 8 bits at booting from eMMC5.0 device?
May I have advice?
Best Regards,
Yuuki
解決済! 解決策の投稿を見る。
Hi Yuuki
what processor and SD port used in the case ?
Best regards
igor
Dear Igor-san,
Thank you for your support.
Prosessor is i.MX6 solo(MCIMX6S5EVM10AB).
SD port is SD4.
Please advise of your findings.
Best Regards,
Yuuki
Hi Yuuki
8-bit eMMC is working fine on i.MX6 reference
board Sabre SPF-27392 p.5
probably there are layout errors or issues
related to layout (signtal integrity), one can try
to check signals by oscilloscope.
Best regards
igor
Hello Igor,
I have the same configuration as Yuuki. i.MX6 Solo and eMMC 5.0 @ SD4 port. I see the eMMC on kernel but can not see eMMC on u boot due to which I'm not able to boot my device over eMMC. Below are my boot configuration settings-
CFG1[7:0]- 01101000
CFG2[7:0]- 11011000
Please help me to resolve this problem.
Thanks in advance.