Date: Thu, 28 Dec 2023 18:45:44 -0800 From: bob prohaska <fbsd@www.zefox.net> To: Mark Millard <marklmi@yahoo.com> Cc: John F Carr <jfc@mit.edu>, "ticso@cicely.de" <ticso@cicely.de>, Marcin Cieslak <saper@saper.info>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: USB-serial adapter suggestions needed Message-ID: <ZY4y2NvvL0N8Db69@www.zefox.net> In-Reply-To: <B371E1D9-410D-40DC-A0D5-AFEC24B15C3D@yahoo.com> References: <55q37289-ss30-nq9o-7r31-086n999p394s@fncre.vasb> <ZYonM2b2X008mpaw@cicely7.cicely.de> <ZYuHW34T1rxwqdz6@www.zefox.net> <C8C30A69-05D5-45FE-B95D-A31BD13B841F@yahoo.com> <23100FB9-BB4A-48FF-A715-84EF7F6F59A6@mit.edu> <6DD2FDE4-77DB-499A-AED8-F179A9DAA0EF@yahoo.com> <ZYxzNqNENpowIOrg@www.zefox.net> <6A38A60B-3281-468D-907C-26AB2F8D07A6@yahoo.com> <ZY3LWKmCPvmLZvzU@www.zefox.net> <B371E1D9-410D-40DC-A0D5-AFEC24B15C3D@yahoo.com>
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On Thu, Dec 28, 2023 at 12:38:58PM -0800, Mark Millard wrote: > On Dec 28, 2023, at 11:24, bob prohaska <fbsd@www.zefox.net> wrote: > > > On Wed, Dec 27, 2023 at 12:27:33PM -0800, Mark Millard wrote: > >> > >> Overall I've not been able to understand what the > >> (various?) hypothesized stage-by-stage byte flow > >> paths are in these notes. > >> > > > > Maybe this will help. The path is > > > > workstation> Ethernet > terminal server:usb-serial > serial wires> GPIO 8/10 > > > > I hesitated to use the words "terminal server" because that has implications > > (distinct IP address, multiple serial interfaces) that don't exist here. > > > > The workstation is a RasPiOS Pi4, the Pi3 host called pelorus is the terminal > > server and the GPIO pins are on the Pi3 host named www.zefox.net . > > Your prior messages reported text referencing .org, such as: > > FreeBSD/arm64 (www.zefox.org) (ttyu1) > > and: > > No, the garbled login prompt originates from www.zefox.org's > serial console. > > and: > > Understood, it's been hard to articulate 8-( Maybe > Workstation > ethernet > pelorus > usb port > gpio 8,10 > console www.zefox.org > is a little clearer > > So: "www.zefox.net <http://www.zefox.net/>" above is a change of report, if I understand > right. > It's my typo 8-( The host generating console output is the Pi3 named www.zefox.org . The host named www.zefox.net isn't involved at all, though it is present and I typed its name in error. > > The Ethernet connection works well enough for all the other hosts that I think > > we can disregard whether it's wired or WiFi and LAN or WAN or all four. > > You have also reported that: > > The Pi3 which reported the garbled login prompt > uses in config.txt: > b@www:/boot/msdos % more config.txt > init_uart_clock=3000000 > enable_uart=1 > kernel=u-boot.bin > kernel7=u-boot.bin > dtoverlay=mmc > force_mac_address=b8:27:eb:71:46:4f > > This is using the mini-uart for the serial console and the > full-function UART for bluetooth. It also is not using > arm_64bit=1 . (So armv7 support instead of aarch64 support?) > You are correct, it's using the mini-uart (which I didn't realize) per sysctl. The machine is running aarch64, the reference to kernel7 in config.txt is a mistake. Bluetooth and WiFi aren't used on www.zefox.org. > https://elinux.org/RPi_Serial_Connection claims: > > QUOTE > . . . the less capable mini-UART with no break detection, no framing errors > detection, no parity bit, no receive timeout interrupt and no DCD, DSR, > DTR or RI signals > END QUOTE > > This contrasts with: > > The Pi3 hosting the usb-serial adapter has in config.txt > bob@pelorus:~ % more /boot/efi/config.txt > [all] > arm_64bit=1 > dtparam=audio=on,i2c_arm=on,spi=on > dtoverlay=mmc > dtoverlay=disable-bt > device_tree_address=0x4000 > kernel=u-boot.bin > > which has the full-function UART for its serial console > and is using arm_64bit=1 . > > Why the variation? > That machine is the terminal server, pelorus, on the LAN. Its internal uart does not participate in the data transmission chain. "Hosting the usb-serial converter" was my euphemism for terminal server. Please accept my apologies for not proofreading more carefully! If there is a better choice of terminology please tell me. Thanks for your patience! bob prohaska
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