Hi Leif, I have been trying my hands-on on replacing the current Legacy BDS loader with the EFI_STUB on a Freescale ARM64 SoC to load Linux and utilize the features of the EFI_STUB.
I am taking a reference from ARM juno support, where I am getting confused about a couple of points: 1. Legacy Linux Loader: I see the following INF inclusion in 'ArmPlatformPkg.dsc'. What do we mean exactly by Legacy Linux Loader here? Is it the built-in Linux Loader which ignores the stub (as you refer to it, in a HiKey related discussion: https://lists.96boards.org/pipermail/dev/2015-March/000083.html) ArmPlatformPkg.dsc ---------------------- # Legacy Linux Loader ArmPkg/Application/LinuxLoader/LinuxLoader.inf 2. Passing a initramfs/initird to the kernel: Using the reference from Juno board, I have added the following to my .dsc. This allows me to specify a ARM64 Image + DTB placed on NOR flash to the kernel and I see that using the BootMenu, I can boot the kernel partially with the same: gArmPlatformTokenSpaceGuid.PcdDefaultBootDescription|L"EFI Linux from NOR flash" gArmPlatformTokenSpaceGuid.PcdDefaultBootDevicePath|L"MemoryMapped(0x0,0x61100000,0x62000000)/Image" gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths|L"MemoryMapped(0x0,0x63000000,0x638FFFFF)/fsl-dtb.dtb" gArmPlatformTokenSpaceGuid.PcdDefaultBootArgument|"console=ttyS0,115200 root=/dev/ram0 earlycon=uart8250,0x21c0500,115200" However, I cannot find a way to provide a .cpio based initramfs/initrd kept on the NOR flash to the kernel. Will I need to use other booting media like a SD card (rather than the NOR flash) and keep the Root-file-system there and invoke all the components via a "startup.nsh" like script: fs0:\Image dtb=fsl-dtb.dtb rootwait console=ttyS0,115200 root=/dev/ram0 earlycon=uart8250,0x21c0500,115200 root=/dev/sda1 Here are my Linux boot logs: Logs: ------ [1] EFI Linux from NOR flash - MemoryMapped(0x0,0x61100000,0x62000000)/Image - Arguments: console=ttyS0,115200 root=/dev/ram0 earlycon=uart8250,0x21c0500,115200 [2] Shell [3] Boot Manager Start: 1 EFI stub: Booting Linux Kernel... EFI stub: Using DTB from configuration table Booting Linux on physical CPU 0x0 Initializing cgroup subsys cpu Linux version 3.19.3+ ..... Regards, Bhupesh _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
