[U-Boot] [PATCH v4 2/4] mx6ul_14x14_evk: Pass refsel and refr fields to avoid hang

[Stefano Babic]

On 30/08/2016 01:37, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam at nxp.com>
> 
> When running a NXP 4.1 kernel with U-Boot mainline on a mx6ul-evk,
> we observe a hang when going into the lowest operational point of cpufreq.
> 
> This hang issue does not happen on the NXP U-Boot version.
> 
> After comparing the SPL DDR initialization against the DCD table
> from NXP U-Boot, the key difference that causes the hang is the
> MDREF register setting:
> 
> DATA 4 0x021B0020 0x00000800
> 
> ,which means:
> 
> REF_SEL = 0 --> Periodic refresh cycle: 64kHz
> REFR = 1 ---> Refresh Rate - 2 refreshes
> 
> So adjust the MDREF initialization for mx6ul_evk accordingly
> to fix the kernel hang issue at low bus frequency.
> 
> Reported-by: Eric Nelson <eric at nelint.com>
> Signed-off-by: Fabio Estevam <fabio.estevam at nxp.com>
> ---

Applied (all series as fix !) to u-boot-imx, thanks !

Best regards,
Stefano Babic



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