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| -rw-r--r-- | doc/README.x86 | 41 |
1 files changed, 18 insertions, 23 deletions
diff --git a/doc/README.x86 b/doc/README.x86 index c5c3010ee2..732d3758e6 100644 --- a/doc/README.x86 +++ b/doc/README.x86 @@ -23,7 +23,8 @@ In this case, known as bare mode, from the fact that it runs on the 'bare metal', U-Boot acts like a BIOS replacement. The following platforms are supported: - - Bayley Bay + - Bayley Bay CRB + - Congatec QEVAL 2.0 & conga-QA3/E3845 - Cougar Canyon 2 CRB - Crown Bay CRB - Galileo @@ -412,18 +413,19 @@ If you want to check both consoles, use '-serial stdio'. Multicore is also supported by QEMU via '-smp n' where n is the number of cores to instantiate. Note, the maximum supported CPU number in QEMU is 255. -The fw_cfg interface in QEMU also provides information about kernel data, initrd, -command-line arguments and more. U-Boot supports directly accessing these informtion -from fw_cfg interface, this saves the time of loading them from hard disk or -network again, through emulated devices. To use it , simply providing them in -QEMU command line: +The fw_cfg interface in QEMU also provides information about kernel data, +initrd, command-line arguments and more. U-Boot supports directly accessing +these informtion from fw_cfg interface, which saves the time of loading them +from hard disk or network again, through emulated devices. To use it , simply +providing them in QEMU command line: $ qemu-system-i386 -nographic -bios path/to/u-boot.rom -m 1024 -kernel /path/to/bzImage -append 'root=/dev/ram console=ttyS0' -initrd /path/to/initrd -smp 8 Note: -initrd and -smp are both optional -Then start QEMU, in U-Boot command line use the following U-Boot command to setup kernel: +Then start QEMU, in U-Boot command line use the following U-Boot command to +setup kernel: => qfw qfw - QEMU firmware interface @@ -437,8 +439,8 @@ qfw <command> => qfw load loading kernel to address 01000000 size 5d9d30 initrd 04000000 size 1b1ab50 -Here the kernel (bzImage) is loaded to 01000000 and initrd is to 04000000. Then, 'zboot' -can be used to boot the kernel: +Here the kernel (bzImage) is loaded to 01000000 and initrd is to 04000000. Then, +'zboot' can be used to boot the kernel: => zboot 02000000 - 04000000 1b1ab50 @@ -490,8 +492,8 @@ Booting Ubuntu -------------- As an example of how to set up your boot flow with U-Boot, here are instructions for starting Ubuntu from U-Boot. These instructions have been -tested on Minnowboard MAX with a SATA driver but are equally applicable on -other platforms and other media. There are really only four steps and its a +tested on Minnowboard MAX with a SATA drive but are equally applicable on +other platforms and other media. There are really only four steps and it's a very simple script, but a more detailed explanation is provided here for completeness. @@ -499,7 +501,7 @@ Note: It is possible to set up U-Boot to boot automatically using syslinux. It could also use the grub.cfg file (/efi/ubuntu/grub.cfg) to obtain the GUID. If you figure these out, please post patches to this README. -Firstly, you will need Ubunutu installed on an available disk. It should be +Firstly, you will need Ubuntu installed on an available disk. It should be possible to make U-Boot start a USB start-up disk but for now let's assume that you used another boot loader to install Ubuntu. @@ -659,7 +661,7 @@ U-Boot: Loading bzImage at address 100000 (5805728 bytes) Magic signature found Initial RAM disk at linear address 0x04000000, size 19215259 bytes - Kernel command line: "console=ttyS0,115200 root=/dev/disk/by-partuuid/965c59ee-1822-4326-90d2-b02446050059 ro" + Kernel command line: "root=/dev/disk/by-partuuid/965c59ee-1822-4326-90d2-b02446050059 ro" Starting kernel ... @@ -679,13 +681,14 @@ above commands into a script since then it will be faster. 240,329 ahci 1,422,704 vesa display -Now the kernel actually starts: +Now the kernel actually starts: (if you want to examine kernel boot up message +on the serial console, append "console=ttyS0,115200" to the kernel command line) [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacct [ 0.000000] Linux version 3.13.0-58-generic (buildd@allspice) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #97-Ubuntu SMP Wed Jul 8 02:56:15 UTC 2015 (Ubuntu 3.13.0-58.97-generic 3.13.11-ckt22) - [ 0.000000] Command line: console=ttyS0,115200 root=/dev/disk/by-partuuid/965c59ee-1822-4326-90d2-b02446050059 ro + [ 0.000000] Command line: root=/dev/disk/by-partuuid/965c59ee-1822-4326-90d2-b02446050059 ro console=ttyS0,115200 It continues for a long time. Along the way you will see it pick up your ramdisk: @@ -736,14 +739,6 @@ If you want to put this in a script you can use something like this: The \ is to tell the shell not to evaluate ${filesize} as part of the setenv command. -You will also need to add this to your board configuration file, e.g. -include/configs/minnowmax.h: - - #define CONFIG_BOOTDELAY 2 - -Now when you reset your board it wait a few seconds (in case you want to -interrupt) and then should boot straight into Ubuntu. - You can also bake this behaviour into your build by hard-coding the environment variables if you add this to minnowmax.h: |