科普時間丨OK1028A

1、科普時間丨ok1028a因為ok1028a-c這塊開發(fā)板在日常的客戶詢問過程中關于gpio的復用、網(wǎng)口的對應關系以及tsn的相關特性問的比較多，故收拾了這篇文檔，以解決客戶的疑問。一、gpio的復用以spi復用為gpio為例在ls1028a.pdf中查找可以看到，1028底板上spi_sin可以復用為gpio_dat13，spi3_sck可復用為gpio3_dat14，spi_sin可復用為gpio3_dat13,spi3_sout可復用為gpio3_dat16。在ls1028.pdf中可以看到對應的rcw字段為spi3_pmux。通過此圖可知 ，當spi3_pmux=1時，引腳被配置為gpi

2、o3_dat16:13,在rcw中修改后，重新編譯替換燒寫即可。rcw路徑：ok1028-linux-fs/packages/firmware/rcw/ls1028ardb/r_sqpp_0x85bb/rcw_1500_gpu600.rcwls028a開發(fā)板驗證階段：rootforlinx:ls /sys/class/gpioexport gpiochip416 gpiochip448 gpiochip480 unexport輸入上述指令浮現(xiàn)四組gpiochip，普通對應關系為：gpiochip480對應gpio1；gpiochip448對應gpio2；gpiochip416對應gpio3；

3、若要驗證單個引腳則在此基礎上做加法即可，gpio3_datx=gpiochip416+x,以gpio3_dat14為例：rootforlinx:echo 430 > /sys/class/gpio/exportrootforlinx:echo out > /sys/class/gpio/gpio430/directionrootforlinx:echo 1 > /sys/class/gpio/gpio430/valuerootforlinx:cat /sys/class/gpio/gpio430/value1rootforlinx:echo 0 > /sys/class

4、/gpio/gpio430/valuerootforlinx:cat /sys/class/gpio/gpio430/value0同時可以量出此引腳凹凸電平的變幻。spi3接口復用為gpio時是整組復用的，當spi3_pmux=1時，引腳被配置為gpio3_dat16:13。二、ok1028a-c網(wǎng)口對應關系eno0為sgmii1g-t protocol,swp0-swp3為qsgmii1g。1、網(wǎng)口switch介紹以太網(wǎng)系統(tǒng)由兩個組件組成：以太網(wǎng)控制器（enetc）和支持tsn的以太網(wǎng)交換機。下圖描述了ls1028a中的以太網(wǎng)子系統(tǒng)。以太網(wǎng)控制器enetc是一個虛擬以太網(wǎng)控制器，支持gbe速

5、度和時光敏感網(wǎng)絡(tsn)功能。enetc提供徹低集成的gbe媒體拜訪控制器(macs)。它支持搶占和各種三層加速和卸載功能的協(xié)議，包括ip,tcp, udp和icmp，同時保持線速度在全部接口。2、以太網(wǎng)控制器特性以太網(wǎng)控制器支持以下特性: implements the full 802.3 specification withpreamble/sfd generation, frame padding generation, crc generation andchecking. one 10/100/1000/2500 mbit/s ethernet port. throughserde

6、s, sgmii (1g/2.5g) and usxgmii (2.5g) mac-physpecificationsare supported. one 10/100/1000 mbit/s ethernet port with rgmiiinterface. one 2500 mbit/s ethernet port connected internallyto tsn switch for switch data transmission. one 1000-mbit/s ethernet port connected internallyto tsn switch for switch

7、 management. supports jumbo ethernet frames with a size up to9600 bytes supports double tagged vlan frames according toieee 802.1q supports ieee 802.1qbu preemption&8226ci express root complex integrated endpointdevice3、tsn以太網(wǎng)交換機特性tsn以太網(wǎng)交換機提供了一組豐盛的以太網(wǎng)交換特性，例如高級的基于tcam的vlan和qos處理，以及用法基于tcam的通用內(nèi)容感知

8、處理器(vcap)的平安處理。設備提供對時光敏感的組網(wǎng)特性，包括ieee1588精確時光協(xié)議、時光感知整形、無縫冗余、逐流過濾和監(jiān)管、搶占、切通交換等。tsn以太網(wǎng)交換機支持以下特性: four external 10/100/1000/2500-mbit/s ethernetports. through serdes, sgmii (1g/2.5g) and usxgmii (2.5g) macphyspecifications are supported. one 2500 mbit/s ethernet port connected internallyto enetc for data

9、 transmission. one 1000 mbit/s ethernet port connected internallyto enetc for management. one internal cpu port, for frame extraction andinjection. 128kb of integrated shared packet memory. fully nonblocking wire-speed switching performancewith weighted random early detection (wred) for all frame sizes.概括起來就是ls1028a最多可以引出6個網(wǎng)口，且都支持tsn。至此文章已結束，希翼您通