[U-Boot] Trying to load old kernel with new u-boot
One of our mx51 based boards doesn't seem to like 2.6.35 kernel with 2014.07 u-boot. We've ported our boards for the new kernel and new u-boot, but we need the old kernel to also work with new u-boot.
So here's what happens...
U-Boot 2014.07-svn83200 (Sep 15 2015 - 15:57:02)
CPU: Freescale i.MX51 rev3.0 at 800 MHz I2C: ready DRAM: 512 MiB Last reset reason:POR, (1) Boot Device: MMC MMC: FSL_SDHC: 0 In: serial Out: serial Err: serial Hit any key to stop autoboot: 0
MMC read: dev # 0, block # 2048, count 6144 ... 6144 blocks read: OK ## Booting kernel from Legacy Image at 92000000 ... Image Name: Linux-2.6.35.3-1129-g691c08a+ Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 2873388 Bytes = 2.7 MiB Load Address: 90008000 Entry Point: 90008000 Verifying Checksum ... OK Loading Kernel Image ... OK
Starting kernel ...
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Looks like new u-boot passes something wrong to the kernel or doesn't pass something we need.
Seems like the first half of the kernel output timing is wrong. I tried different bauds to no avail.
On a working board we see early on...
entering mx51_clocks_init turning off all clocks external_low_reference = 00008000 external_high_reference = 01588800 ckih2_reference = 01770000 oscillator_reference = 016e3600 entering clk_tree_init clk_tree_init for mx51 returned from clk_tree_init setting uart_main_clk to pll3_sw_clk MXC_CCM_CSCDR1 is 00c30458 MXC_Early serial console at MMIO 0x73fc0000 (options '115200') bootconsole [ttymxc1] enabled
And then later... console [ttymxc1] enabled, bootconsole disabled
Looks like the early console is not working. I'll have to debug this tomorrow, but if anyone has suggestions that would be great.
-- View this message in context: http://u-boot.10912.n7.nabble.com/Trying-to-load-old-kernel-with-new-u-boot-... Sent from the U-Boot mailing list archive at Nabble.com.
When I set putty to 38400 I get the first half of the kernel console output fine and the second half is garbage.
So that tells me early kernel is outputting at 38400. Even though we don't set it to that. When I print gd->baudrate in board_late_init() I get 115200.
So what does 2014.07 u-boot do differently than 2009.08 that causes the early kernel console to get messed up?
That's my trail at the moment.
-- View this message in context: http://u-boot.10912.n7.nabble.com/Trying-to-load-old-kernel-with-new-u-boot-... Sent from the U-Boot mailing list archive at Nabble.com.
On Wed, Sep 16, 2015 at 1:17 PM, DaveKucharczyk david.kucharczyk@gmail.com wrote:
When I set putty to 38400 I get the first half of the kernel console output fine and the second half is garbage.
So that tells me early kernel is outputting at 38400. Even though we don't set it to that. When I print gd->baudrate in board_late_init() I get 115200.
So what does 2014.07 u-boot do differently than 2009.08 that causes the early kernel console to get messed up?
If I recall correctly they have different parents or the uart clock.
On Wed, Sep 16, 2015 at 7:23 PM, Fabio Estevam festevam@gmail.com wrote:
On Wed, Sep 16, 2015 at 1:17 PM, DaveKucharczyk david.kucharczyk@gmail.com wrote:
When I set putty to 38400 I get the first half of the kernel console output fine and the second half is garbage.
So that tells me early kernel is outputting at 38400. Even though we don't set it to that. When I print gd->baudrate in board_late_init() I get 115200.
So what does 2014.07 u-boot do differently than 2009.08 that causes the early kernel console to get messed up?
If I recall correctly they have different parents or the uart clock.
I meant "different parents for the uart clock"
Fabio Estevam-2 wrote
I meant "different parents for the uart clock"
Fabio, that would make sense why it doesn't work when setting 2014 u-boot CSCDR1 to the value in 2009 u-boot. I can check all the combinations of clock division I want and it's never going to work since the parent is different.
The patch for u-boot 2009.08 states... ------------------ Subject: [PATCH] ENGR00133727: uart outputs messy code when kernel starts on mx51
uart outputs messy code when kernel starts on mx51. Change uart clock to use pll2 as source clock. ------------------
Looks like we never implemented that patch in our 2009 u-boot. Looks like that patch made it to 2014 u-boot.
So I tried setting the uart clock parent to default in u-boot 2014 in arch/arm/cpu/armv7/mx5/lowlevel_init.S, but still the same thing happens.
Any suggestions?
Basically I want kernel 2.6.35 to boot cleanly on the console using u-boot 2014 on an mx51 board.
-- View this message in context: http://u-boot.10912.n7.nabble.com/Trying-to-load-old-kernel-with-new-u-boot-... Sent from the U-Boot mailing list archive at Nabble.com.
participants (2)
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DaveKucharczyk -
Fabio Estevam