From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Warren <swarren@wwwdotorg.org>
Date: Mon, 15 Jun 2015 22:01:50 -0600
Subject: [U-Boot] Very slow fatload on bcm2835
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References: <20150611203514.2f83d4b3@north>
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On 06/11/2015 12:35 PM, Jakub Kicinski wrote:
> Hello!
> 
> I'm using latest git source of U-Boot on Raspberry Pi Compute Module 
> and performance of fatload is quite bad.  Does anyone have any clue
> about what can be wrong?  Is it the lack of cache?
> 
> Sample boot log:
...
> reading zImage                
> 4003816 bytes read in 48930 ms (79.1 KiB/s)

I see this too. I bisected it to:
33fe2fb8df01 ARM: mmc: bcm283x: Remove get_timer_us() from mmc driver

Marek, this is the second symptom I bisected to this patch. Something
seems quite wrong with it. Did changing to the other timer function
change the timer tick rate or something? FWIW, "sleep 10" at the shell
prompt appears to run for the correct amount of time, so I guess it's
not that.