question about uboot mt7620 RAM_VERSION
Stefan Roese
sr at denx.de
Tue Oct 25 06:46:41 CEST 2022
Hi Kang-sen,
On 24.10.22 19:58, Kang-sen Lu wrote:
> I am wondering if you have read my reply on 10/18. It is very strange to
> find that unless I had uboot to do a saveenv, the RAM_VERSION uboot.bin
> would not run properly in DRAM.
Frankly, I don't really understand this message. It's not clear to
me, what you are doing and what is working and what is failing.
I thought you were trying to boot the current mainline U-Boot RAM
version u-boot.bin. If yes, which build target did you use? What
does it show on the serial console?
Thanks,
Stefan
> Thanks.
>
> Kang-sen
>
> On Tue, Oct 18, 2022 at 10:05 AM Kang-sen Lu <klu at waav.com
> <mailto:klu at waav.com>> wrote:
>
> Hi, Stefan:
>
> Thanks for your reply.
>
> The uboot in the zbtlink mt7620 router has the signatures follows:
>
> U-Boot 1.1.3 (Nov 9 2016 - 15:34:50)
>
> SoC:MediaTek MT7620
> DRAM: Memory Testing..131072K OK. is 128 MB
> relocate_code Pointer at: 87fb0000
> enable ephy clock...done. rf reg 29 = 5
> SSC disabled.
> spi_wait_nsec: 29
> spi device id: ef 40 18 0 0 (40180000)
> Flash: W25Q128BV
>
> I would like to share my strange experience about RAM version uboot
> for mt7620. By pure luck, I found that when I tried to load a newly
> built uboot with startup menu option 8, unless I change the
> filename, say, from uboot.bin to uboot1.bin, the newly loaded uboot
> would not startup properly in RAM.
>
> I don't have the knowledge to find out why this variable "modifies"
> to be none-zero is so important to the execution of uboot in RAM.
> Maybe some expert in this group can easily figure that out.
>
> Thanks.
>
> Kang-sen
>
> On Tue, Oct 18, 2022 at 7:53 AM Stefan Roese <sr at denx.de
> <mailto:sr at denx.de>> wrote:
>
> Hi Kang-sen,
>
> (added Weijie Gao to Cc)
>
> On 17.10.22 14:11, Kang-sen Lu wrote:
> > I am building uboot.bin for mt7620 router.
> >
> > I used start menu option 8, a hidden one choice, to load
> uboot.bin through
> > tftp.
> >
> > The tftp transfer is OK. But when the new uboot starts, it hang.
>
> So which mainline U-Boot build target did you use? Don't you see
> any output on the serial console at all?
>
> > I am wondering if the RAM_VERSION for mt7620 still works.
>
> In mainline U-Boot this is usually handled this way. The SPL U-Boot
> version is responsible for the low-level HW init, like DRAM/DDR init
> etc. It's hard to impossible to chainload this SPL part from a
> running U-Boot version.
>
> The "RAM_VERSION" is usually the main U-Boot proper image
> "u-boot.bin".
> So in general you are using the correct file here. Even though I
> have
> not idea, if the build target is correct for your "mt7620 router".
>
> Thanks,
> Stefan
>
Viele Grüße,
Stefan Roese
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
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