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大家好,咨询下,GPU配置,VRAM是做什么的?

看AM335X GPU资料,要设置
setenv bootargs 'console=ttyO0,115200n8 root=/dev/nfs nfsroot=<nfshostipaddress>:<rootpath>,nolock rw mem=256M ip=dhcp earlyprintk=serial vram=50M'
men-256M 是DDR3的大小吧,,那VRAM=50M ?是做什么的?配置GPU的显存大小?
求指点下·谢谢了·