From: Timur Tabi <timur@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [u-boot-release] [RFC PATCH 17/17] ns16550: wait for TENT before initializing
Date: Mon, 1 Oct 2012 09:27:15 -0500 [thread overview]
Message-ID: <5069A843.80504@freescale.com> (raw)
In-Reply-To: <1348272087-29608-18-git-send-email-scottwood@freescale.com>
Scott Wood wrote:
> This prevents output problems (including a loss of synchronization
> observed on p2020 that persisted for quite a while) if SPL has output
> still on its way out. I'm not sure why this is only now beginning to
> happen, though.
The subject line says "TENT", but the macro says "TEMT".
Also, it would be nice to see a description of this bit somewhere.
>
> Signed-off-by: Scott Wood <scottwood@freescale.com>
> ---
> drivers/serial/ns16550.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
> index 0c23955..66201b6 100644
> --- a/drivers/serial/ns16550.c
> +++ b/drivers/serial/ns16550.c
> @@ -36,6 +36,9 @@
>
> void NS16550_init(NS16550_t com_port, int baud_divisor)
> {
> + while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
> + ;
> +
> serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
> #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \
> defined(CONFIG_AM33XX)
--
Timur Tabi
Linux kernel developer at Freescale
next prev parent reply other threads:[~2012-10-01 14:27 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-22 0:01 [U-Boot] [RFC PATCH 00/17] Convert p1_p2_rdb_pc to new spl Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 01/17] Add u-boot-pad.bin target to the Makefile Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 02/17] spl: rename u-boot-pad.bin to u-boot-with-spl.bin Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 03/17] powerpc: remove .fixup test Scott Wood
2012-09-24 15:30 ` Peter Tyser
2012-09-24 18:47 ` Scott Wood
2012-09-24 23:38 ` Tom Rini
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 04/17] powerpc/mpc85xx: fix TLB alignment Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 05/17] powerpc/mpc8xxx: move LAW code into arch/powerpc/cpu/mpc8xxx Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 06/17] spl/mpc85xx: move udelay to cpu code Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 07/17] spl: include resetvec and lib8xxx Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 08/17] spl/powerpc: introduce CONFIG_SPL_INIT_MINIMAL Scott Wood
2012-09-24 23:48 ` Tom Rini
2012-09-24 23:52 ` Scott Wood
2012-09-25 0:03 ` Tom Rini
2012-09-25 0:17 ` Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 09/17] spl/85xx: new SPL support Scott Wood
2012-09-24 23:51 ` Tom Rini
2012-09-24 23:54 ` Scott Wood
2012-09-25 0:04 ` Tom Rini
2012-09-25 0:08 ` Scott Wood
2012-09-25 0:13 ` Tom Rini
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 10/17] powerpc/p1_p2_rdb_pc: " Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 11/17] spl/nand: introduce CONFIG_SPL_NAND_MINIMAL Scott Wood
2012-09-24 23:55 ` Tom Rini
2012-09-25 0:02 ` Scott Wood
2012-09-25 0:13 ` Tom Rini
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 12/17] spl/nand: config symbol documentation Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 13/17] spl/nand: Add minimal-spl driver for Freescale eLBC NAND Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 14/17] spl: introduce CONFIG_SPL_TARGET Scott Wood
2012-09-22 0:12 ` Tom Rini
2012-09-24 18:54 ` Scott Wood
2012-09-24 19:03 ` Tom Rini
2012-09-24 20:05 ` Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 15/17] p1_p2_rdb_pc: convert from nand_spl to new spl Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 16/17] powerpc/mpc85xx/p2020rdb-pc: fix SPL DDR config Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 17/17] ns16550: wait for TENT before initializing Scott Wood
2012-10-01 14:27 ` Timur Tabi [this message]
2012-09-22 0:13 ` [U-Boot] [RFC PATCH 00/17] Convert p1_p2_rdb_pc to new spl Tom Rini
2012-09-24 18:50 ` Scott Wood
2012-09-24 19:06 ` Tom Rini
2012-09-24 19:15 ` Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 00/22] " Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 01/22] serial/ns16550: don't build serial_ns16550 with MIN_FUNCTIONS Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 02/22] serial/ns16550: wait for TEMT before initializing Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 03/22] powerpc/mpc85xx: move debug tlb entry after TLB is in known state Scott Wood
2012-10-30 9:26 ` Prabhakar Kushwaha
2012-10-30 21:07 ` Scott Wood
2012-10-31 6:17 ` Prabhakar Kushwaha
2012-10-31 22:08 ` Scott Wood
2012-10-31 22:44 ` McClintock Matthew-B29882
[not found] ` <CAEsOVNeZAyH1nxfgnjPYUG4=7yxjF9rjsRWrpa=WYW8edfiM3Q@mail.gmail.com>
2012-10-31 22:45 ` McClintock Matthew-B29882
2012-10-31 22:51 ` Scott Wood
2012-11-16 2:12 ` Scott Wood
2012-11-26 20:53 ` Andy Fleming
2012-10-30 2:04 ` [U-Boot] [PATCH v2 04/22] powerpc/mpc85xx: add comma before "already enabled" Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 05/22] Add u-boot-pad.bin target to the Makefile Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 06/22] spl: rename u-boot-pad.bin to u-boot-with-spl.bin Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 07/22] spl: introduce CONFIG_SPL_TARGET Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 08/22] powerpc: change .fixup test to a GCC version test Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 09/22] powerpc/mpc85xx: fix TLB alignment Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 10/22] powerpc/mpc8xxx: move LAW code into arch/powerpc/cpu/mpc8xxx Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 11/22] spl/mpc85xx: move udelay to cpu code Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 12/22] spl: include resetvec and lib8xxx Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 13/22] spl/mpc85xx: rename cpu_init_nand.c to spl_minimal.c Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 14/22] powerpc/mpc85xx: consistently use COBJS-y Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 15/22] spl/powerpc: introduce CONFIG_SPL_INIT_MINIMAL Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 16/22] spl/85xx: new SPL support Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 17/22] powerpc/mpc85xx/p1_p2_rdb_pc: " Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 18/22] spl/nand: introduce CONFIG_SPL_NAND_DRIVERS, _BASE, and _ECC Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 19/22] spl/nand: config symbol documentation Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 20/22] powerpc/mpc85xx/p1_p2_rdb_pc: convert from nand_spl to new spl Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 21/22] powerpc/mpc85xx/p1_p2_rdb_pc: clean up memory map Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 22/22] powerpc/mpc85xx/p2020rdb-pca: Use L2 SRAM for SPL boot Scott Wood
2012-10-30 3:17 ` Tabi Timur-B04825
2012-10-30 23:37 ` Scott Wood
2012-11-13 22:41 ` [U-Boot] [PATCH v3] " Scott Wood
2012-10-30 17:04 ` [U-Boot] [PATCH v2 00/22] Convert p1_p2_rdb_pc to new spl Tom Rini
2012-10-30 20:17 ` Scott Wood
2012-10-30 21:12 ` Tom Rini
2012-11-13 22:42 ` Scott Wood
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