[External] - Slow MMC IO with Raspberry CM3+ Module

Mario Lombardo ml at akamo.de
Thu Nov 4 16:21:00 CET 2021


thank you very much. Applying the two patches mentioned in the series resolve the issues immediately.

Is it expected to have this enhancement in the upcoming u-boot release?


> On 3. Nov 2021, at 21:57, Vincent Fazio <vfazio at xes-inc.com> wrote:
> Mario,
>> -----Original Message-----
>> From: U-Boot <u-boot-bounces at lists.denx.de> On Behalf Of Mario 
>> Lombardo
>> Sent: Wednesday, November 3, 2021 5:40 AM
>> To: u-boot at lists.denx.de
>> Subject: [External] - Slow MMC IO with Raspberry CM3+ Module
>> Dear u-boot list,
>> I recently compiled (latest: 2021.10) code of uboot as a boot loader 
>> for the Compute Module 3+ (Raspberry). Everything works fine except one issue:
>> the IO from the storage is extreme slow. I read about issues in the 
>> past related to ext file systems. However the present issue relates to 
>> both ext and fat file systems so I assume its cause is different.
> Please see this series: https://patchwork.ozlabs.org/project/uboot/list/?series=262375
> And this RPi issue: https://github.com/raspberrypi/firmware/issues/1619
>> This is what I did:
>> U-Boot>   setenv pio_kernel "recovery/kernel.img"
>> U-Boot>   setenv pio_initrd "recovery/initrd.img"
>> U-Boot>   fatload mmc 0:1 ${kernel_addr_r} ${pio_kernel}
>> 5299624 bytes read in 45262 ms (114.3 KiB/s)
>> U-Boot>   fatload mmc 0:1 ${ramdisk_addr_r} ${pio_initrd}
>> 24239932 bytes read in 206978 ms (114.3 KiB/s)
>> The configuration of by build is attached.
>> Is there anyone else experiencing this kind of issues?
>> Thank you very much.
>> Mario
>> CAUTION: This email originated from outside of the organization. Do 
>> not click links or open attachments unless you recognize the sender 
>> and know the content is safe.
> -Vincent

Mario Lombardo
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