From: Manfred Huber <man.huber@arcor.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] Beagleboard: SPL hangs on serial init
Date: Sat, 23 Mar 2013 11:11:17 +0100 [thread overview]
Message-ID: <514D7FC5.5000007@arcor.de> (raw)
In-Reply-To: <CABxcv==YLAy6_+1EUsa+Ep3C1pyUdSMFOXA=FMBN1=_NT_Ukig@mail.gmail.com>
Hi all,
probably I found the error. It should be a bug in the ROM code of the OMAP3.
Depending on the Booting Sequence of the OMAP3, SPL is hanging or not.
If ROM code configures UART3 before SPL starts from NAND it will lead to
a hang of the SPL. If UART3 is not configured, SPL boots correctly from
NAND.
If ROM code configures UART3 it leaves the UART in a bad state. Although
Transmitter is not empty (TEMT is not set), ROM code disables the UART.
Therefore Transmitter can never get empty.
In a normal Booting Sequence where NAND is for UART3 the bug will never
appear.
There are some solutions:
1. Configuring UART3 first and let Transmitter send until Transmitter is
empty.
2. Soft reset of Transmitter. (OMAP3 specific, NS16550 has no soft reset)
3. ...
Please tell me your assessment.
Best regards,
Manfred Huber
next prev parent reply other threads:[~2013-03-23 10:11 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-27 13:09 [U-Boot] Beagleboard: SPL hangs on serial init man.huber at arcor.de
2013-03-16 13:13 ` Manfred Huber
2013-03-19 14:49 ` Tom Rini
2013-03-19 23:52 ` Manfred Huber
2013-03-20 0:05 ` Javier Martinez Canillas
2013-03-20 1:27 ` Tom Rini
2013-03-20 23:09 ` Manfred Huber
2013-03-21 21:08 ` Javier Martinez Canillas
2013-03-23 10:11 ` Manfred Huber [this message]
2013-03-21 19:03 ` [U-Boot] [PATCH] omap3_beagle: Enable CONFIG_SYS_NS16550_BROKEN_TEMT Manfred Huber
2013-03-21 21:28 ` Javier Martinez Canillas
2013-03-21 22:21 ` Tom Rini
2013-03-21 22:28 ` Scott Wood
2013-03-25 22:02 ` [U-Boot] [PATCH 1/1 v2] omap3_beagle: Enabling UART3 first allows the Transmitter to be empty Manfred Huber
2013-03-27 4:50 ` Manfred Huber
2013-03-27 9:29 ` Javier Martinez Canillas
2013-03-27 13:57 ` Tom Rini
2013-03-28 5:55 ` Manfred Huber
2013-03-29 8:19 ` Manfred Huber
2013-03-28 15:21 ` Tom Rini
2013-03-27 13:37 ` Andreas Bießmann
2013-03-27 17:22 ` Javier Martinez Canillas
2013-03-28 6:06 ` Manfred Huber
2013-03-28 8:45 ` Andreas Bießmann
2013-03-28 9:11 ` Javier Martinez Canillas
2013-03-28 9:50 ` Andreas Bießmann
2013-03-28 15:21 ` Tom Rini
2013-03-29 8:33 ` Manfred Huber
2013-03-29 9:20 ` [U-Boot] [PATCH 1/1 v3] " Manfred Huber
2013-03-29 9:43 ` Albert ARIBAUD
2013-03-29 12:34 ` Tom Rini
2013-03-29 12:42 ` [U-Boot] [PATCH 1/1 v4] omap3_beagle: Flush UART3 xmit on enable if TEMT is broken Manfred Huber
2013-03-29 12:52 ` [U-Boot] [PATCH 1/1 v5] " Manfred Huber
2013-04-02 7:46 ` Javier Martinez Canillas
2013-04-02 8:59 ` Andreas Bießmann
2013-04-08 16:56 ` [U-Boot] [U-Boot, 1/1, " Tom Rini
2013-04-10 22:12 ` [U-Boot] [PATCH v1 1/1] omap3: Display MHz instead of mHz on the console Manfred Huber
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