Hello dave_mcl,   Here is the link for latest firmware: Dell Firmware Update Package for Marvell FastLinQ 57800 series Ethernet adapters [URL]  
I have a R640 here [personal information removed by Mod] with this network card and are looking for latest drivers & firmware due to bonding issue with Debian Bookworm. iDrac reports it as "QLogic 577xx/578xx 10 Gb Ethernet BCM57800" lspci reports it as"Broadcom Inc. and subsidiaries NetXtreme II BCM57800 1/10 Gigabit Ethernet (rev 10)" It has 2 x 10Gb eth ports & 2 x 1Gb eth ports Thanks Dave
Latest firmware/drivers for NetXtreme II BCM57800