Hello, Am Freitag, 19. Oktober 2018, 08:53:15 CEST schrieb Wolfgang Denk: > In message <2092760.TlMJupW03t@ada> you wrote: > > I played with the extlinux.conf format snippets from the U-Boot docs. > > Upstream extlinux docs are not really helpful, especially not for options > > regarding dtb> > > files. And I tried a config based on the Boot Loader Spec: > > Scanning mmc 2:1... > > Found /boot/extlinux/extlinux.conf > > Retrieving file: /boot/extlinux/extlinux.conf > > 366 bytes read in 268 ms (1000 Bytes/s) > > Ignoring unknown command: title > > Ignoring unknown command: version > > Ignoring unknown command: options > > Ignoring unknown command: linux > > Ignoring unknown command: devicetree > > > > Am I right, U-Boot does not support that spec at all? Files are in > > different positions, and the keywords are all different? If so, then the > > U-Boot documentation is misleading (and people will be frustrated to > > follow the hints given in there). > > It would definitely help if you tell us which actual command > (sequence) you used to get this output, and what the exact content > of this extlinux.conf was.
Okay first the content of /boot/extlinux/extlinux.conf from the root filesystem, which does not work (of course without additional linebreaks from my mail client): title PTXdist version 4.9.133 options mtdparts=gpmi-nand:8M(fcb),7M(reserved)ro,512k(env1), 512k(env2),-(fs) ubi.mtd=fs console=ttymxc0,115200 rootwait rw root=/dev/ mmcblk0p1 linux /boot/zImage devicetree /boot/imx6dl-ttcore.dtb As you might guess, I use ptxdist for building the BSP for an i.MX6 based platform. Currently everything is on a SD-Card and the system can boot from that card, if I load kernel image and dtb manually in U-Boot (or use another extlinux.conf). > Without such information, we cannot even guess what you did. I was basically following the instructions from doc/README.distro so I read http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/ as mentioned in section "Boot Configuration Files" and set CONFIG_DISTRO_DEFAULTS=y and added the following to the board configuration header file in include/configs/ /* PHYS_ADDR is 0x10000000 for i.MX6S, * Kernel doc recommends to put dtb at 128 MiB, zImage above 32 MiB, * but below 128 MiB. So we put them there and scriptaddr after dtb. * We don't strictly need ramdisk_addr_r, but just set it to some * reasonable value according to doc/README.distro … * This should not collide with U-Boot which places itself at the * lowest 8k and something around 8 MB at the top of the memory, the * board currently has 512 MiB. */ #define MEM_LAYOUT_ENV_SETTINGS \ "kernel_addr_r=0x12000000\0" \ "fdt_addr_r=0x18000000\0" \ "scriptaddr=0x18100000\0" \ "pxefile_addr_r=0x18200000\0" \ "ramdisk_addr_r=0x18300000\0" #define BOOT_TARGET_DEVICES(func) \ func(MMC, mmc, 0) \ func(MMC, mmc, 1) \ func(MMC, mmc, 2) \ func(UBIFS, ubifs, 0) \ func(USB, usb, 0) #ifndef CONFIG_SPL_BUILD #include <config_distro_defaults.h> #include <config_distro_bootcmd.h> #endif So in U-Boot env the following is set (this is populated by U-Boot itself by default, I removed non interesting lines and added some linebreaks): boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} $ {prefix}${script}; source ${scriptaddr} boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any $ {scriptaddr} ${prefix}extlinux/extlinux.conf boot_net_usb_start=usb start boot_prefixes=/ /boot/ boot_script_dhcp=boot.scr.uimg boot_scripts=boot.scr.uimg boot.scr boot_targets=mmc0 mmc1 mmc2 ubifs0 usb0 bootcmd=run distro_bootcmd bootcmd_mmc0=setenv devnum 0; run mmc_boot bootcmd_mmc1=setenv devnum 1; run mmc_boot bootcmd_mmc2=setenv devnum 2; run mmc_boot bootcmd_ubifs0=setenv devnum 0; run ubifs_boot bootcmd_usb0=setenv devnum 0; run usb_boot distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done mmc_boot=if mmc dev ${devnum}; then setenv devtype mmc; run scan_dev_for_boot_part; fi pxefile_addr_r=0x18200000 scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done; scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then run scan_dev_for_boot; fi; done scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} $ {prefix}extlinux/extlinux.conf; then echo Found ${prefix}extlinux/ extlinux.conf; run boot_extlinux; echo SCRIPT FAILED: continuing...; fi scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} $ {devnum}:${distro_bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done What happens is what I wrote in the first mail. extlinux.conf is found and 'sysboot' fails because it ignores all the keywords. What actually works is using an extlinux.conf similar to the examples in doc/ README.distro, but there are two things to mention: 1) keywords are used which are not mentioned in the upstream extlinux documentation 2) keywords from the bootloader spec don't work at all So, although the idea to have a config file in the Linux filesystem an let the distribution set things in it, might be the same as in the Boot Loader Specification, my impression is, U-Boot does not follow the specification. Neither does it support multiple files (just /boot/extlinux/extlinux.conf works) nor the keywords specified? An extlinux.conf that works is this: label PTXdist kernel /boot/zImage fdtdir /boot append mtdparts=gpmi-nand:8M(fcb),7M(reserved)ro,512k(env1),512k(env2),- (UBI) ubi.mtd=UBI console=ttymxc0,115200 rootwait rw root=/dev/mmcblk0p1 I have to add, I currently still use U-Boot 2016.09, but I did a thorough research in master and the responsible code in cmd/pxe.c did not change from a functional point of view since 2016.09. Greets Alex _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
