2013.01.07. 20:44 keltezéssel, Gabor Juhos írta:
2013.01.07. 18:15 keltezéssel, Daniel Schwierzeck írta:
2013/1/7 Gabor Juhos juhosg@openwrt.org:
The bootm command supports subcommands since long time however those subcommands are not yet usable on MIPS.
The patch is based on the ARM implementation, and it adds support for the 'prep' and 'go' subcommands only.
Signed-off-by: Gabor Juhos juhosg@openwrt.org Cc: Daniel Schwierzeck daniel.schwierzeck@googlemail.com
arch/mips/lib/bootm.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
thanks but how did you test it?
I have tested it with the following commands:
U-Boot> setenv serverip 192.168.1.254; setenv ipaddr 192.168.1.1 U-Boot> tftp 0xa0800000 openwrt-ath79-uImage-initramfs-lzma.bin dup 1 speed 100 Using eth0 device TFTP from server 192.168.1.254; our IP address is 192.168.1.1 Filename 'openwrt-ath79-uImage-initramfs-lzma.bin'. Load address: 0xa0800000 Loading: ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ########################################################### done Bytes transferred = 2627082 (28160a hex) U-Boot> bootm loados Trying to execute a command out of order bootm - boot application image from memory
U-Boot> bootm start 0xa0800000 ## Booting kernel from Legacy Image at a0800000 ... Image Name: MIPS OpenWrt Linux-3.8-rc2 Created: 2013-01-07 19:19:26 UTC Image Type: MIPS Linux Kernel Image (lzma compressed) Data Size: 2627018 Bytes = 2.5 MiB Load Address: 80100000 Entry Point: 80100000 Verifying Checksum ... OK U-Boot> bootm loados Uncompressing Kernel Image ... OK U-Boot> bootm prep U-Boot> bootm go
Starting kernel ...
Linux version 3.8.0-rc2 (juhosg@mag2) (gcc version 4.6.4 20121106 (prerelease) (Linaro GCC 4.6-2012.11) ) #24 Mon Jan 7 20:19:20 CET 2013 bootconsole [early0] enabled CPU revision is: 00019374 (MIPS 24Kc) ...
I needed to fix a relocation problem in cmd_bootm.c [1] to make it properly working.
Hm, I think that I know why I did not notice that. I have tested it on a board which uses an old U-Boot version as the primary bootloader. Because lots of features are disabled in that I have compiled a more usable version and I'm using that as a 2nd stage loader. It is loaded to address 0x80060000 by the original bootloader. The Linux kernel uncompressed to 0x80100000 so it did not clobber the strings.
I have changed the load address of the kernel and it indeed fails:
U-Boot> setenv serverip 192.168.1.254; setenv ipaddr 192.168.1.1 U-Boot> tftp 0xa0800000 openwrt-ath79-uImage-initramfs-lzma.bin dup 1 speed 100 Using eth0 device TFTP from server 192.168.1.254; our IP address is 192.168.1.1 Filename 'openwrt-ath79-uImage-initramfs-lzma.bin'. Load address: 0xa0800000 Loading: ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ########################################################### done Bytes transferred = 2627551 (2817df hex) U-Boot> bootm start 0xa0800000 ## Booting kernel from Legacy Image at a0800000 ... Image Name: MIPS OpenWrt Linux-3.8-rc2 Created: 2013-01-07 19:54:05 UTC Image Type: MIPS Linux Kernel Image (lzma compressed) Data Size: 2627487 Bytes = 2.5 MiB Load Address: 80060000 Entry Point: 80060000 Verifying Checksum ... OK U-Boot> bootm loados Uncompressing Kernel Image ... OK U-Boot> bootm prep bootm - boot application image from memory
Usage: bootm [addr [arg ...]] - boot application image stored in memory passing arguments 'arg ...'; when booting a Linux kernel, 'arg' can be the address of an initrd image When booting a Linux kernel which requires a flat device-tree a third argument is required which is the address of the device-tree blob. To boot that kernel without an initrd image, use a '-' for the second argument. If you do not pass a third a bd_info struct will be passed instead
Sub-commands to do part of the bootm sequence. The sub-commands must be issued in the order below (it's ok to not issue all sub-commands): start [addr [arg ...]] loados - load OS image fdt - relocate flat device tree cmdline - OS specific command line processing/setup bdt - OS specific bd_t processing prep - OS specific prep before relocation or go go - start OS U-Boot>
With your relocation patch the problem is gone.
-Gabor