From: Atish Patra <Atish.Patra@wdc.com> To: "bmeng.cn@gmail.com" <bmeng.cn@gmail.com> Cc: "qemu-riscv@nongnu.org" <qemu-riscv@nongnu.org>, "sagark@eecs.berkeley.edu" <sagark@eecs.berkeley.edu>, "kbastian@mail.uni-paderborn.de" <kbastian@mail.uni-paderborn.de>, Anup Patel <Anup.Patel@wdc.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Alistair Francis <Alistair.Francis@wdc.com>, "palmer@dabbelt.com" <palmer@dabbelt.com> Subject: Re: [PATCH] RISC-V: Place DTB at 3GB boundary instead of 4GB Date: Fri, 18 Dec 2020 08:00:32 +0000 [thread overview] Message-ID: <67cbbde886c3ae6e57e837e79f466f4156a910f8.camel@wdc.com> (raw) In-Reply-To: <CAEUhbmX16h5S5Y0kFsnDv6t2cnn6we-b-9U_cbnEQkrrckYy0w@mail.gmail.com> On Fri, 2020-12-18 at 15:33 +0800, Bin Meng wrote: > Hi Atish, > > On Fri, Dec 18, 2020 at 3:27 PM Atish Patra <Atish.Patra@wdc.com> > wrote: > > > > On Fri, 2020-12-18 at 15:21 +0800, Bin Meng wrote: > > > Hi Atish, > > > > > > On Fri, Dec 18, 2020 at 5:48 AM Atish Patra <atish.patra@wdc.com> > > > wrote: > > > > > > > > Currently, we place the DTB at 2MB from 4GB or end of DRAM > > > > which > > > > ever is > > > > lesser. However, Linux kernel can address only 1GB of memory > > > > for > > > > RV32. > > > > Thus, it can not map anything beyond 3GB (assuming 2GB is the > > > > starting address). > > > > As a result, it can not process DT and panic if opensbi dynamic > > > > firmware > > > > is used. > > > > > > > > Fix this by placing the DTB at 2MB from 3GB or end of DRAM > > > > whichever is lower. > > > > > > > > Signed-off-by: Atish Patra <atish.patra@wdc.com> > > > > --- > > > > hw/riscv/boot.c | 4 ++-- > > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > > > > > With this patch, 32-bit sifive_u still does not boot kernel with > > > the > > > following patch applied on 5.10: > > > https://patchwork.kernel.org/project/linux-riscv/patch/20201217074855.1948743-1-atish.patra@wdc.com/ > > > > > > Command I used: > > > $ qemu-system-riscv32 -nographic -M sifive_u -m 1G -smp 5 -kernel > > > arch/riscv/boot/Image > > > > > > 32-bit virt cannot boot the same kernel image with memory set to > > > 2G > > > either: > > > $ qemu-system-riscv32 -nographic -M virt -m 2G -smp 4 -kernel > > > arch/riscv/boot/Image > > > > > > > Hi Bin, > > As mentioned in the email on the linux mailing list, this patch > > only > > solves 2GB problem. sifive_u problem is solved by Alistair's > > patch[1]. > > > > He is planning to send the PR soon. The issue with sifive_u boot > > was it > > was failing the 32 bit test earlier resulting a 2MB aligned address > > instead of 4MB. > > Ah, I see. However my testing shows that virt with 2G still does not > boot with this patch. > Strange. I verified again with following combination with -bios and without bios parameter. 1. virt 32/64 with 1GB/2GB memory 2. sifive_u 32/64 bit with 1GB/2GB memory (Alistair's patch included) Can you share the boot log along with the head commit of Qemu and commandline ? I am using 5.10 kernel with my kernel fix. > > > > [1] > > https://www.mail-archive.com/qemu-devel@nongnu.org/msg767886.html > > > > Regards, > Bin -- Regards, Atish
WARNING: multiple messages have this Message-ID (diff)
From: Atish Patra <Atish.Patra@wdc.com> To: "bmeng.cn@gmail.com" <bmeng.cn@gmail.com> Cc: "sagark@eecs.berkeley.edu" <sagark@eecs.berkeley.edu>, "qemu-riscv@nongnu.org" <qemu-riscv@nongnu.org>, "kbastian@mail.uni-paderborn.de" <kbastian@mail.uni-paderborn.de>, Alistair Francis <Alistair.Francis@wdc.com>, "palmer@dabbelt.com" <palmer@dabbelt.com>, Anup Patel <Anup.Patel@wdc.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org> Subject: Re: [PATCH] RISC-V: Place DTB at 3GB boundary instead of 4GB Date: Fri, 18 Dec 2020 08:00:32 +0000 [thread overview] Message-ID: <67cbbde886c3ae6e57e837e79f466f4156a910f8.camel@wdc.com> (raw) In-Reply-To: <CAEUhbmX16h5S5Y0kFsnDv6t2cnn6we-b-9U_cbnEQkrrckYy0w@mail.gmail.com> On Fri, 2020-12-18 at 15:33 +0800, Bin Meng wrote: > Hi Atish, > > On Fri, Dec 18, 2020 at 3:27 PM Atish Patra <Atish.Patra@wdc.com> > wrote: > > > > On Fri, 2020-12-18 at 15:21 +0800, Bin Meng wrote: > > > Hi Atish, > > > > > > On Fri, Dec 18, 2020 at 5:48 AM Atish Patra <atish.patra@wdc.com> > > > wrote: > > > > > > > > Currently, we place the DTB at 2MB from 4GB or end of DRAM > > > > which > > > > ever is > > > > lesser. However, Linux kernel can address only 1GB of memory > > > > for > > > > RV32. > > > > Thus, it can not map anything beyond 3GB (assuming 2GB is the > > > > starting address). > > > > As a result, it can not process DT and panic if opensbi dynamic > > > > firmware > > > > is used. > > > > > > > > Fix this by placing the DTB at 2MB from 3GB or end of DRAM > > > > whichever is lower. > > > > > > > > Signed-off-by: Atish Patra <atish.patra@wdc.com> > > > > --- > > > > hw/riscv/boot.c | 4 ++-- > > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > > > > > With this patch, 32-bit sifive_u still does not boot kernel with > > > the > > > following patch applied on 5.10: > > > https://patchwork.kernel.org/project/linux-riscv/patch/20201217074855.1948743-1-atish.patra@wdc.com/ > > > > > > Command I used: > > > $ qemu-system-riscv32 -nographic -M sifive_u -m 1G -smp 5 -kernel > > > arch/riscv/boot/Image > > > > > > 32-bit virt cannot boot the same kernel image with memory set to > > > 2G > > > either: > > > $ qemu-system-riscv32 -nographic -M virt -m 2G -smp 4 -kernel > > > arch/riscv/boot/Image > > > > > > > Hi Bin, > > As mentioned in the email on the linux mailing list, this patch > > only > > solves 2GB problem. sifive_u problem is solved by Alistair's > > patch[1]. > > > > He is planning to send the PR soon. The issue with sifive_u boot > > was it > > was failing the 32 bit test earlier resulting a 2MB aligned address > > instead of 4MB. > > Ah, I see. However my testing shows that virt with 2G still does not > boot with this patch. > Strange. I verified again with following combination with -bios and without bios parameter. 1. virt 32/64 with 1GB/2GB memory 2. sifive_u 32/64 bit with 1GB/2GB memory (Alistair's patch included) Can you share the boot log along with the head commit of Qemu and commandline ? I am using 5.10 kernel with my kernel fix. > > > > [1] > > https://www.mail-archive.com/qemu-devel@nongnu.org/msg767886.html > > > > Regards, > Bin -- Regards, Atish
next prev parent reply other threads:[~2020-12-18 8:01 UTC|newest] Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-12-17 21:48 [PATCH] RISC-V: Place DTB at 3GB boundary instead of 4GB Atish Patra 2020-12-17 21:48 ` Atish Patra 2020-12-17 22:31 ` Palmer Dabbelt 2020-12-17 22:31 ` Palmer Dabbelt 2020-12-17 22:35 ` Atish Patra 2020-12-17 22:35 ` Atish Patra 2020-12-17 22:39 ` Palmer Dabbelt 2020-12-17 22:39 ` Palmer Dabbelt 2020-12-18 7:21 ` Bin Meng 2020-12-18 7:21 ` Bin Meng 2020-12-18 7:27 ` Atish Patra 2020-12-18 7:27 ` Atish Patra 2020-12-18 7:33 ` Bin Meng 2020-12-18 7:33 ` Bin Meng 2020-12-18 8:00 ` Atish Patra [this message] 2020-12-18 8:00 ` Atish Patra 2020-12-18 8:42 ` Bin Meng 2020-12-18 8:42 ` Bin Meng 2020-12-18 19:46 ` Atish Patra 2020-12-18 19:46 ` Atish Patra 2020-12-22 5:35 ` Bin Meng 2020-12-22 5:35 ` Bin Meng 2020-12-22 19:59 ` Atish Patra 2020-12-22 19:59 ` Atish Patra 2020-12-23 1:20 ` Bin Meng 2020-12-23 1:20 ` Bin Meng 2020-12-29 4:49 ` Bin Meng 2020-12-29 4:49 ` Bin Meng 2021-01-04 20:24 ` Atish Patra 2021-01-04 20:24 ` Atish Patra 2021-01-05 3:06 ` Bin Meng 2021-01-05 3:06 ` Bin Meng 2021-01-05 3:11 ` Bin Meng 2021-01-05 3:11 ` Bin Meng 2021-01-05 21:02 ` Alistair Francis 2021-01-05 21:02 ` Alistair Francis 2021-01-05 23:44 ` Atish Patra 2021-01-05 23:44 ` Atish Patra 2021-01-06 0:04 ` Bin Meng 2021-01-06 0:04 ` Bin Meng 2021-01-06 2:14 ` Atish Patra 2021-01-06 2:14 ` Atish Patra
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