From: Matt Porter <mporter@ti.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 7/9] am33xx: support ti814x mmc reference clock
Date: Mon, 4 Mar 2013 08:57:31 -0500 [thread overview]
Message-ID: <20130304135731.GD6209@beef> (raw)
In-Reply-To: <80ea5e8e05d24152a4572f154a7124f0@DFLE72.ent.ti.com>
On Sun, Mar 03, 2013 at 10:34:08PM +0000, Peter Korsgaard wrote:
> >>>>> "Matt" == Matt Porter <mporter@ti.com> writes:
>
> Matt> TI814x has a 192MHz hsmmc reference clock. Select that clock rate
> Matt> when building for TI814x.
>
> Matt> Signed-off-by: Matt Porter <mporter@ti.com>
>
> Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
>
> Did you figure out why it was working for you with 96 MHz ref?
Unfortunately not at a root cause level. Unless I'm missing something I
would have expected the calculations from the supplied 96 MHz ref clock
to result in 2x the clock the SD card can handle due to the incorrect
divider. However, with the LA attached, I found that a 2-3 MHz SDCLK was
being generated after the capability probe occurs. Odd and incorrect,
but functional. After switching to 192MHz I was able to sample a
nominal 25MHz SDCLK as expected on a regular SD card advertising that as
its capability. I don't like it but I'm going to mark this down as
"something undocumented" as I only have PG1.0 silicon but can't find an
errata sheet for that version right now.
-Matt
next prev parent reply other threads:[~2013-03-04 13:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-01 1:29 [U-Boot] [PATCH v2 0/9] Add TI814x EVM Support Matt Porter
2013-03-01 1:29 ` [U-Boot] [PATCH v2 1/9] am33xx: convert defines from am33xx-specific to generic names Matt Porter
2013-03-03 22:29 ` Peter Korsgaard
2013-03-01 1:29 ` [U-Boot] [PATCH v2 2/9] am33xx: refactor emif4/ddr to support multiple EMIF instances Matt Porter
2013-03-03 22:30 ` Peter Korsgaard
2013-03-01 1:29 ` [U-Boot] [PATCH v2 3/9] am33xx: refactor am33xx clocks and add ti814x support Matt Porter
2013-03-02 15:37 ` [U-Boot] [PATCH v3 " Matt Porter
2013-03-01 1:29 ` [U-Boot] [PATCH v2 4/9] am33xx: refactor am33xx mux support " Matt Porter
2013-03-01 1:29 ` [U-Boot] [PATCH v2 5/9] am33xx: add ti814x specific register definitions Matt Porter
2013-03-01 1:29 ` [U-Boot] [PATCH v2 6/9] am33xx: add dmm support to emif4 library Matt Porter
2013-03-01 1:29 ` [U-Boot] [PATCH v2 7/9] am33xx: support ti814x mmc reference clock Matt Porter
2013-03-01 21:14 ` Tom Rini
2013-03-03 22:34 ` Peter Korsgaard
[not found] ` <80ea5e8e05d24152a4572f154a7124f0@DFLE72.ent.ti.com>
2013-03-04 13:57 ` Matt Porter [this message]
2013-03-04 14:04 ` Peter Korsgaard
2013-03-01 1:29 ` [U-Boot] [PATCH v2 8/9] ns16550: enable quirks for ti814x Matt Porter
2013-03-03 22:34 ` Peter Korsgaard
2013-03-01 1:29 ` [U-Boot] [PATCH v2 9/9] ti814x_evm: add ti814x evm board support Matt Porter
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