From: "Marek Behún" <kabel@kernel.org>
To: "Pali Rohár" <pali@kernel.org>
Cc: "Stefan Roese" <sr@denx.de>,
u-boot@lists.denx.de, "Marek Behún" <marek.behun@nic.cz>
Subject: Re: [PATCH u-boot-marvell 00/13] Yet another kwboot improvements
Date: Tue, 26 Oct 2021 15:06:10 +0200 [thread overview]
Message-ID: <20211026150610.44a5e98d@thinkpad> (raw)
In-Reply-To: <20211026124048.lprqsoqow63cwqom@pali>
On Tue, 26 Oct 2021 14:40:48 +0200
Pali Rohár <pali@kernel.org> wrote:
> What is happening here? I do not know. But as Marek told me that
> observed same issue and replacing USB-UART cable by another decreased
> transfer time. So I think that issue is somewhere in USB-UART
> transmitter. My guess is that USB-UART transmitter send at 921600 speed:
> start bit, 8 bits of data, stop bit and then loooong idle pause (logical
> one). After that sends another 10 bits.
Yes, my FT232RL USB-UART converters do not send at higher speeds,
although they report baudrate change.
I do not really know what is going on. Maybe the ftdi-sio driver needs
to be looked at. (It definitely needs to be looked at, because of other
things. Last I looked into it the baudrate change code seemed okay.)
Using pl2303 converter works like a charm.
Note that I have another FT232RL converter for MOX, which works at
1.8V, and on MOX higher speeds work correctly.
Maybe some of the FT232RL chips are those fake ones?
Stefan, could you check in a different way whether your converter can
transfer at higher speed? For example with another device, or in U-Boot
via kermit / ymodem, or whatnot.
Marek
next prev parent reply other threads:[~2021-10-26 13:06 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 13:12 [PATCH u-boot-marvell 00/13] Yet another kwboot improvements Marek Behún
2021-10-25 13:12 ` [PATCH u-boot-marvell 01/13] tools: kwboot: Initialize rfds to zero Marek Behún
2021-10-26 5:41 ` Stefan Roese
2021-10-25 13:12 ` [PATCH u-boot-marvell 02/13] tools: kwboot: Fix initialization of tty device Marek Behún
2021-10-26 5:41 ` Stefan Roese
2021-10-25 13:12 ` [PATCH u-boot-marvell 03/13] tools: kwboot: Reserve enough space for patching kwbimage in memory Marek Behún
2021-10-26 5:42 ` Stefan Roese
2021-10-25 13:12 ` [PATCH u-boot-marvell 04/13] tools: kwboot: Validate 4-byte image data checksum Marek Behún
2021-10-26 5:43 ` Stefan Roese
2021-10-25 13:12 ` [PATCH u-boot-marvell 05/13] tools: kwboot: Inject baudrate change back code after data part Marek Behún
2021-10-26 5:43 ` Stefan Roese
2021-10-25 13:12 ` [PATCH u-boot-marvell 06/13] tools: kwboot: Recalculate 4-byte data checksum after injecting baudrate code Marek Behún
2021-10-26 5:44 ` Stefan Roese
2021-10-25 13:12 ` [PATCH u-boot-marvell 07/13] tools: kwboot: Correctly set configuration of UART for BootROM messages Marek Behún
2021-10-26 5:45 ` Stefan Roese
2021-10-25 13:12 ` [PATCH u-boot-marvell 08/13] tools: kwboot: Show verbose message when waiting for baudrate change magic Marek Behún
2021-10-26 5:45 ` Stefan Roese
2021-10-25 13:13 ` [PATCH u-boot-marvell 09/13] tools: kwboot: Simplify code for aligning image header Marek Behún
2021-10-26 5:45 ` Stefan Roese
2021-10-25 13:13 ` [PATCH u-boot-marvell 10/13] tools: kwboot: Do not modify kwbimage header before increasing its size Marek Behún
2021-10-26 5:46 ` Stefan Roese
2021-10-25 13:13 ` [PATCH u-boot-marvell 11/13] tools: kwboot: Calculate real used space in kwbimage header when calling kwboot_img_grow_hdr() Marek Behún
2021-10-26 5:48 ` Stefan Roese
2021-10-25 13:13 ` [PATCH u-boot-marvell 12/13] tools: kwboot: Change retry loop from decreasing to increasing Marek Behún
2021-10-26 5:49 ` Stefan Roese
2021-10-25 13:13 ` [PATCH u-boot-marvell 13/13] tools: kwboot: Resend first 3 xmodem retry packets immediately Marek Behún
2021-10-26 5:50 ` Stefan Roese
2021-10-25 14:39 ` [PATCH u-boot-marvell 00/13] Yet another kwboot improvements Stefan Roese
2021-10-25 14:42 ` Pali Rohár
2021-10-25 15:15 ` Stefan Roese
2021-10-26 8:33 ` Pali Rohár
2021-10-26 8:45 ` Stefan Roese
2021-10-26 9:06 ` Pali Rohár
2021-10-26 11:09 ` Stefan Roese
2021-10-26 12:40 ` Pali Rohár
2021-10-26 13:06 ` Marek Behún [this message]
2021-10-26 14:06 ` Stefan Roese
2021-10-26 14:21 ` Stefan Roese
2021-10-26 14:48 ` Pali Rohár
2021-10-26 15:13 ` Stefan Roese
2021-10-26 15:20 ` Marek Behún
2021-10-26 15:25 ` Stefan Roese
2021-10-26 15:34 ` Marek Behún
2021-10-26 15:40 ` Stefan Roese
2021-10-26 18:48 ` Pali Rohár
2021-10-27 5:09 ` Stefan Roese
2021-10-27 13:52 ` Pali Rohár
2021-10-27 14:10 ` Pali Rohár
2021-10-27 15:08 ` Marek Behún
2021-10-27 15:13 ` Pali Rohár
2021-10-27 15:27 ` Stefan Roese
2021-10-27 15:29 ` Pali Rohár
2021-10-27 21:03 ` Pali Rohár
2021-10-28 6:16 ` Stefan Roese
2021-10-28 11:04 ` Pali Rohár
2021-10-28 14:20 ` Stefan Roese
2021-10-28 17:00 ` Pali Rohár
2021-10-29 4:44 ` Stefan Roese
2021-11-03 7:46 ` Stefan Roese
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