{"id":2233233,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2233233/?format=json","web_url":"http://patchwork.ozlabs.org/project/buildroot/patch/20260505213606.3873472-1-ju.o@free.fr/","project":{"id":27,"url":"http://patchwork.ozlabs.org/api/1.1/projects/27/?format=json","name":"Buildroot development","link_name":"buildroot","list_id":"buildroot.buildroot.org","list_email":"buildroot@buildroot.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260505213606.3873472-1-ju.o@free.fr>","date":"2026-05-05T21:36:04","name":"[1/2] board/pc/linux.config: enable CONFIG_EFI_STUB","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"0103307f08df9edcac144ab951a4efcbc985fc86","submitter":{"id":80537,"url":"http://patchwork.ozlabs.org/api/1.1/people/80537/?format=json","name":"Julien Olivain","email":"ju.o@free.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/buildroot/patch/20260505213606.3873472-1-ju.o@free.fr/mbox/","series":[{"id":502900,"url":"http://patchwork.ozlabs.org/api/1.1/series/502900/?format=json","web_url":"http://patchwork.ozlabs.org/project/buildroot/list/?series=502900","date":"2026-05-05T21:36:04","name":"[1/2] board/pc/linux.config: enable CONFIG_EFI_STUB","version":1,"mbox":"http://patchwork.ozlabs.org/series/502900/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2233233/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2233233/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":["incoming-buildroot@patchwork.ozlabs.org","buildroot@buildroot.org"],"Delivered-To":["patchwork-incoming-buildroot@legolas.ozlabs.org","buildroot@buildroot.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=buildroot.org header.i=@buildroot.org\n header.a=rsa-sha256 header.s=default header.b=KUPkkAdI;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=buildroot.org\n (client-ip=2605:bc80:3010::136; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"buildroot-bounces@buildroot.org","Sender":"\"buildroot\" "},"content":"When the Linux Kernel image does not include the EFI stub [1],\nGrub2 EFI linux loader fallback to the legacy i386 loading.\nSee [2] [3]. Grub 2.14 enabled the NX compatible for the EFI\nimage in [4].\n\nWhen booting a Linux Kernel without the EFI stub with Grub 2.14 with\nNX flag, the boot fails before starting the kernel with a EDK2 page\nfault error [5]:\n\n!!!! X64 Exception Type - 0E(#PF - Page-Fault) CPU Apic ID - 00000000 !!!!\nExceptionData - 0000000000000003 I:0 R:0 U:0 W:1 P:1 PK:0 SS:0 SGX:0\n\nThis commit adds CONFIG_EFI_STUB to board/pc/linux.config to make sure\ngrub will load the Kernel using its efi loading code.\n\nThis commit is needed with EDK2 with NX protection enabled and\nGrub 2.14 also enabling NX.\n\n[1] https://docs.kernel.org/admin-guide/efi-stub.html\n[2] https://gitlab.freedesktop.org/gnu-grub/grub/-/blob/grub-2.14/grub-core/loader/efi/linux.c#L532\n[3] https://gitlab.freedesktop.org/gnu-grub/grub/-/blob/grub-2.14/grub-core/loader/i386/linux.c#L675\n[4] https://gitlab.freedesktop.org/gnu-grub/grub/-/commit/f5bb766e688b1180e0ace3417d4947a934957a31\n[5] https://github.com/tianocore/edk2/blob/edk2-stable202602/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c#L273\n\nSigned-off-by: Julien Olivain \n---\n board/pc/linux.config | 1 +\n 1 file changed, 1 insertion(+)","diff":"diff --git a/board/pc/linux.config b/board/pc/linux.config\nindex 43b15c94be..cbc4f5a6b0 100644\n--- a/board/pc/linux.config\n+++ b/board/pc/linux.config\n@@ -5,6 +5,7 @@ CONFIG_SMP=y\n CONFIG_HYPERVISOR_GUEST=y\n CONFIG_PARAVIRT=y\n CONFIG_EFI=y\n+CONFIG_EFI_STUB=y\n CONFIG_NET=y\n CONFIG_PACKET=y\n CONFIG_UNIX=y\n","prefixes":["1/2"]}