On 28 July 2015 at 01:50, Bin Meng bmeng.cn@gmail.com wrote:
Hi Simon,
On Tue, Jul 28, 2015 at 5:47 AM, Simon Glass sjg@chromium.org wrote:
The steps required to boot a Linux distribution from U-Boot on x86 are not very complicated, but it is a good idea to have these written down in an accessible place.
Document how to examine the boot media from U-Boot, how to load a kernel, load a ramdisk, set the kernel boot arguments and start the kernel. With these instructions Ubuntu boots mostly normally on Minnowmax.
Note that the TSC timer does not operate correctly and gives warnings in the boot log. I expect that ACPI support will solve this.
Signed-off-by: Simon Glass sjg@chromium.org
Reviewed-by: Bin Meng bmeng.cn@gmail.com
Please see some comments below.
doc/README.x86 | 275 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 275 insertions(+)
diff --git a/doc/README.x86 b/doc/README.x86 index 5d71244..5435d79 100644 --- a/doc/README.x86 +++ b/doc/README.x86 @@ -325,6 +325,278 @@ mtrr - List and set the Memory Type Range Registers (MTRR). These are used to mode to use. U-Boot sets up some reasonable values but you can adjust then with this command.
+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 +testinged on Minnowboard MAX with a SATA driver but are equally applicable on
tested
Fixed
+other platforms and other media. There are really only four steps and its a +very simple script, but a more detailed explaination is provided here for
explanation
fixed
+completeness.
[snip]
+If you want to put this in a script you can use something like this:
- setenv bootargs root=UUID=b2aaf743-0418-4d90-94cc-3e6108d7d968 ro
- setenv boot zboot 03000000 0 04000000 ${filesize}
I believe \ is not needed.
Otherwise it will set zboot to the value of ${filesize} when you issue the 'setenv' command. I've added a comment. Let me know if we should change it.
- setenv bootcmd "ext2load scsi 0:2 03000000 /boot/vmlinuz-3.13.0-58-generic; ext2load scsi 0:2 04000000 /boot/initrd.img-3.13.0-58-generic; run boot"
- saveenv
[snip]
Applied to u-boot-x86.