Re: U-Boot loaded RAMDisk crashes Linux on MT7623
Hi Daniel, Am Montag, den 19.07.2021, 18:34 +0100 schrieb Daniel Golle: > Hi, > > I writing in the hope that someone has a good idea about why U-boot > is > handing over a broken memory address for a loaded ramdisk which > results > in Linux crashing very early on boot on MediaTek's MT7623N SoC > (ARMv7). > If anyone has a good idea why this is happening, I'd be very glad, as > this currently prevents me from updating that target in OpenWrt. > Background: > OpenWrt used to have the initramdisk built-into the kernel itself. > Having it separate is nicer as then you won't need to recompile the > kernel or even have a compiler installed in order to modify the > ramdisk. This already works great on MT7622 and it'd be great to have > it the same way on MT7623 (and MT7629 in future). > > So when loading a uImage.FIT with RAMDisk subimage to me it looks > like > U-Boot is not translating the address of the ramdisk correctly, see > logs below: > > U-Boot> tftpboot 0x8800 openwrt-mediatek-mt7623-bpi_bananapi-r2- > initramfs-recovery.itb > Using ethernet@1b10 device > TFTP from server 192.168.5.2; our IP address is 192.168.5.100 > Filename 'openwrt-mediatek-mt7623-bpi_bananapi-r2-initramfs- > recovery.itb'. > Load address: 0x8800 > Loading: > # > > # > > # > > # > > # > > # > > # > > # > > # > > # > > # > 13 MiB/s > done > Bytes transferred = 10492520 (a01a68 hex) > U-Boot> bootm > ## Loading kernel from FIT Image at 8800 ... >Using 'config-1' configuration >Trying 'kernel-1' kernel subimage > Description: ARM OpenWrt Linux-5.10.51 > Type: Kernel Image > Compression: gzip compressed > Data Start: 0x88e4 > Data Size:4944975 Bytes = 4.7 MiB > Architecture: ARM > OS: Linux > Load Address: 0x80008000 > Entry Point: 0x80008000 > Hash algo:crc32 > Hash value: 9da8225f > Hash algo:sha1 > Hash value: ea4e69501bed0925ecdee0bb6b3a3b489fedc38c >Verifying Hash Integrity ... crc32+ sha1+ OK > ## Loading ramdisk from FIT Image at 8800 ... >Using 'config-1' configuration >Trying 'initrd-1' ramdisk subimage > Description: ARM OpenWrt bpi_bananapi-r2 initrd > Type: RAMDisk Image > Compression: Unknown Compression > Data Start: 0x884b7668 > Data Size:5511960 Bytes = 5.3 MiB > Architecture: ARM > OS: Linux > Load Address: unavailable > Entry Point: unavailable you could try to explicitely set load and entry address to 0. > Hash algo:crc32 > Hash value: 01e5fbf0 > Hash algo:sha1 > Hash value: 6ceb78df26920d97dee505ddeb0318e0c1522ba0 >Verifying Hash Integrity ... crc32+ sha1+ OK > WARNING: 'compression' nodes for ramdisks are deprecated, please fix > your .its file! > ## Loading fdt from FIT Image at 8800 ... >Using 'config-1' configuration >Trying 'fdt-1' fdt subimage > Description: ARM OpenWrt bpi_bananapi-r2 device tree blob > Type: Flat Device Tree > Compression: uncompressed > Data Start: 0x889f9288 > Data Size:33453 Bytes = 32.7 KiB > Architecture: ARM > Hash algo:crc32 > Hash value: a2599155 > Hash algo:sha1 > Hash value: 59c64737be8bda92b33417dfadca87e9c4662be2 >Verifying Hash Integrity ... crc32+ sha1+ OK >Booting using the fdt blob at 0x889f9288 >Uncompressing Kernel Image >Loading Ramdisk to ff4b9000, end ff9fab18 ... OK >^^ >Using Device Tree in place at 889f9288, end 88a04534 > > Starting kernel ... > > [0.00] Booting Linux on physical CPU 0x0 > [0.00] Linux version 5.10.51 (daniel@box) (arm-openwrt-linux- > muslgnueabi-gcc (OpenWrt GCC 8.4.0 r17073+11-8bb4437c01) 8.4.0, GNU > ld (GNU Binutils) 2.34) #0 SMP PREEMPT Mon Jul 19 12:26:15 2021 > [0.00] CPU: ARMv7 Processor [410fc073] revision 3 (ARMv7), > cr=10c5387d > [0.00] CPU: div instructions available: patching division > code > [0.00] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing > instruction cache > [
Re: U-Boot loaded RAMDisk crashes Linux on MT7623
Hi again, On Mon, Jul 19, 2021 at 06:34:38PM +0100, Daniel Golle wrote: > ... >Loading Ramdisk to ff4b9000, end ff9fab18 ... OK >^^ >Using Device Tree in place at 889f9288, end 88a04534 > > Starting kernel ... > ... > [0.00] Zone ranges: > [0.00] Normal [mem 0x8000-0xafff] > [0.00] HighMem [mem 0xb000-0xefff] > [0.00] Movable zone start for each node > [0.00] Early memory node ranges > [0.00] node 0: [mem 0x8000-0xefff] > [0.00] Initmem setup node 0 [mem > 0x8000-0xefff] > [0.00] 8<--- cut here --- > [0.00] Unable to handle kernel paging request at virtual address > 3f9fab0c > > ^^ > ... I've found the answer myself, thanks to another patch posted to this list, solving the same problem for another board: [RFC 1/1] board: sifive: unmatched: use zero copy for initrd So just like there, setting initrd_high (in this case to 0xafff) solved the problem. Sorry for the noise :)
U-Boot loaded RAMDisk crashes Linux on MT7623
Hi, I writing in the hope that someone has a good idea about why U-boot is handing over a broken memory address for a loaded ramdisk which results in Linux crashing very early on boot on MediaTek's MT7623N SoC (ARMv7). If anyone has a good idea why this is happening, I'd be very glad, as this currently prevents me from updating that target in OpenWrt. Background: OpenWrt used to have the initramdisk built-into the kernel itself. Having it separate is nicer as then you won't need to recompile the kernel or even have a compiler installed in order to modify the ramdisk. This already works great on MT7622 and it'd be great to have it the same way on MT7623 (and MT7629 in future). So when loading a uImage.FIT with RAMDisk subimage to me it looks like U-Boot is not translating the address of the ramdisk correctly, see logs below: U-Boot> tftpboot 0x8800 openwrt-mediatek-mt7623-bpi_bananapi-r2-initramfs-recovery.itb Using ethernet@1b10 device TFTP from server 192.168.5.2; our IP address is 192.168.5.100 Filename 'openwrt-mediatek-mt7623-bpi_bananapi-r2-initramfs-recovery.itb'. Load address: 0x8800 Loading: # # # # # # # # # # # 13 MiB/s done Bytes transferred = 10492520 (a01a68 hex) U-Boot> bootm ## Loading kernel from FIT Image at 8800 ... Using 'config-1' configuration Trying 'kernel-1' kernel subimage Description: ARM OpenWrt Linux-5.10.51 Type: Kernel Image Compression: gzip compressed Data Start: 0x88e4 Data Size:4944975 Bytes = 4.7 MiB Architecture: ARM OS: Linux Load Address: 0x80008000 Entry Point: 0x80008000 Hash algo:crc32 Hash value: 9da8225f Hash algo:sha1 Hash value: ea4e69501bed0925ecdee0bb6b3a3b489fedc38c Verifying Hash Integrity ... crc32+ sha1+ OK ## Loading ramdisk from FIT Image at 8800 ... Using 'config-1' configuration Trying 'initrd-1' ramdisk subimage Description: ARM OpenWrt bpi_bananapi-r2 initrd Type: RAMDisk Image Compression: Unknown Compression Data Start: 0x884b7668 Data Size:5511960 Bytes = 5.3 MiB Architecture: ARM OS: Linux Load Address: unavailable Entry Point: unavailable Hash algo:crc32 Hash value: 01e5fbf0 Hash algo:sha1 Hash value: 6ceb78df26920d97dee505ddeb0318e0c1522ba0 Verifying Hash Integrity ... crc32+ sha1+ OK WARNING: 'compression' nodes for ramdisks are deprecated, please fix your .its file! ## Loading fdt from FIT Image at 8800 ... Using 'config-1' configuration Trying 'fdt-1' fdt subimage Description: ARM OpenWrt bpi_bananapi-r2 device tree blob Type: Flat Device Tree Compression: uncompressed Data Start: 0x889f9288 Data Size:33453 Bytes = 32.7 KiB Architecture: ARM Hash algo:crc32 Hash value: a2599155 Hash algo:sha1 Hash value: 59c64737be8bda92b33417dfadca87e9c4662be2 Verifying Hash Integrity ... crc32+ sha1+ OK Booting using the fdt blob at 0x889f9288 Uncompressing Kernel Image Loading Ramdisk to ff4b9000, end ff9fab18 ... OK ^^ Using Device Tree in place at 889f9288, end 88a04534 Starting kernel ... [0.00] Booting Linux on physical CPU 0x0 [0.00] Linux version 5.10.51 (daniel@box) (arm-openwrt-linux-muslgnueabi-gcc (OpenWrt GCC 8.4.0 r17073+11-8bb4437c01) 8.4.0, GNU ld (GNU Binutils) 2.34) #0 SMP PREEMPT Mon Jul 19 12:26:15 2021 [0.00] CPU: ARMv7 Processor [410fc073] revision 3 (ARMv7), cr=10c5387d [0.00] CPU: div instructions available: patching division code [0.00] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [0.00] OF: fdt: Machine model: Bananapi BPI-R2 [0.00] earlycon: uart8250 at MMIO32 0x11004000 (options '') [0.00] printk: bootconsole [uart8250] enabled [0.00] Memory policy: Data cache writealloc [0.00] Zone ranges: [0.00] Normal [mem 0x8000-0xafff] [0.00] HighMem [mem 0xb000-0xefff] [
