From: Scott Wood <scottwood@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 2/2 v3] FSL/eSDHC: enable the clock to detect the SD card
Date: Fri, 18 May 2012 10:55:06 -0500 [thread overview]
Message-ID: <4FB670DA.4000304@freescale.com> (raw)
In-Reply-To: <1337335022-18501-2-git-send-email-Chang-Ming.Huang@freescale.com>
On 05/18/2012 04:57 AM, Chang-Ming.Huang at freescale.com wrote:
> From: Jerry Huang <Chang-Ming.Huang@freescale.com>
>
> For FSL low-end processors (VVN2.2), in order to detect the SD card,
> we should enable PEREN, HCKEN and IPGEN to enable the clock.
> Otherwise, after booting the u-boot, and then inserting the SD card,
> the SD card can't be detected.
> For SDHC VVN2.3 IP, these bits are reserved, and SDCLKEN is used.
> And when accessing to these reserved bit, no any impact happened.
Again, have you talked to a hardware designer and confirmed that there's
no impact from setting these bits on chips where they're reserved? Just
because you don't notice any obvious impact doesn't mean it's totally safe.
-Scott
next prev parent reply other threads:[~2012-05-18 15:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-18 9:57 [U-Boot] [PATCH 1/2 v2] SDHC/MMC: fix the wrong infomation after change SD card Chang-Ming.Huang at freescale.com
2012-05-18 9:57 ` [U-Boot] [PATCH 2/2 v3] FSL/eSDHC: enable the clock to detect the " Chang-Ming.Huang at freescale.com
2012-05-18 15:55 ` Scott Wood [this message]
2012-05-21 2:34 ` Huang Changming-R66093
2012-07-11 9:31 ` Huang Changming-R66093
2012-07-13 10:36 ` Marek Vasut
2012-05-18 16:03 ` Marek Vasut
2012-05-21 2:19 ` Huang Changming-R66093
2012-07-11 9:29 ` [U-Boot] [PATCH 1/2 v2] SDHC/MMC: fix the wrong infomation after change " Huang Changming-R66093
2012-07-13 21:32 ` Andy Fleming
2012-07-14 5:00 ` Marek Vasut
2012-07-30 7:00 ` Huang Changming-R66093
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