Good day, How many serial ports do you get? Two
Also has anyone tried the audio input? Ron Swiernik -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Martin Neitzel Sent: Friday, March 10, 2023 7:40 AM To: [email protected] Cc: [email protected] Subject: Re: Which ARM SBC would work well with NetBSD? EXTERNAL EMAIL: Think before you click. > > o can I create a NetBSD bootable micro SD card, or does one have to > > use Debian or Android on these A-20 Olimex SBCs? > > NetBSD runs fine on A20. You can look at > https://urldefense.proofpoint.com/v2/url?u=http-3A__wiki.netbsd.org_ports_evbarm_allwinner_&d=DwIDAg&c=EJ8lPn3CS79b-sA4ljp-U4RsN8_iB80P3JvPEatNQQ0&r=U9aNKT_4t7_3F1rdsF8u4GeNKqSUjVs9w_zArnMwukQ&m=IgFLRIKNkLsDcySMXrOnwB6n949X_aXh7BoT9lzFBQ3KcBmddUZ46YUX2bTZP9CA&s=6YEhkqdr6E-D2taHanv3aYx2zk-UHNjUIS8zILbL7SI&e= > > for details on creating a bootable SD card Another thumbs up from me: I'm using an old Olimex a20-onlinuxino-micro and, at least 1+ year ago, it booted netbsd just fine. > > o can I hook up a serial concole via a standard RS232 cable? > > No, most SBC use a serial port with TTL levels (usually 0 and +3.3V), not > RS232 levels. You need a USB-UART adapter like FTDI-based one, or this one: > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.olimex.com_Products_Breadboarding_BB-2DCH340T_open-2Dsource-2Dhardware&d=DwIDAg&c=EJ8lPn3CS79b-sA4ljp-U4RsN8_iB80P3JvPEatNQQ0&r=U9aNKT_4t7_3F1rdsF8u4GeNKqSUjVs9w_zArnMwukQ&m=IgFLRIKNkLsDcySMXrOnwB6n949X_aXh7BoT9lzFBQ3KcBmddUZ46YUX2bTZP9CA&s=KpWFnbB8yQKiQ9wW8WeHjIbsUxGuEsQcaR5rAH55gU0&e= > I'm using https://urldefense.proofpoint.com/v2/url?u=https-3A__www.olimex.com_Products_Components_Cables_USB-2DSerial-2DCable_USB-2DSERIAL-2DF_&d=DwIDAg&c=EJ8lPn3CS79b-sA4ljp-U4RsN8_iB80P3JvPEatNQQ0&r=U9aNKT_4t7_3F1rdsF8u4GeNKqSUjVs9w_zArnMwukQ&m=IgFLRIKNkLsDcySMXrOnwB6n949X_aXh7BoT9lzFBQ3KcBmddUZ46YUX2bTZP9CA&s=v7MVmPJF5yhENQzkk1TSKpnv4IaJCtF_NMFL5oRy5jU&e= which directly connects between the boad's pins and a laptop. I also have serial links between my ARM boards at the 3.3V level, using three simple jump wires from, say, https://urldefense.proofpoint.com/v2/url?u=https-3A__www.olimex.com_Products_Breadboarding_JUMPER-2DWIRES_JW-2D200x10-2DFF_&d=DwIDAg&c=EJ8lPn3CS79b-sA4ljp-U4RsN8_iB80P3JvPEatNQQ0&r=U9aNKT_4t7_3F1rdsF8u4GeNKqSUjVs9w_zArnMwukQ&m=IgFLRIKNkLsDcySMXrOnwB6n949X_aXh7BoT9lzFBQ3KcBmddUZ46YUX2bTZP9CA&s=ADpo4fsynYDkrp9P6fTKrFSrsUvugEK4Ac-E2IDLj9s&e= (Their images just feature male ends; make sure you order the correct FF/MM/FM/ ends.) This is dirt cheap and extremly helpful, ion particular with the very early boot stages. Martin Neitzel
