Re: Re: [PATCH v4 0/6] rpi5: initial support

Ivan T. Ivanov
2024-01-22T14:16:40Z

Hi,

On 01-22 13:57, Ivan T. Ivanov wrote:
> > Am 20.01.24 um 10:48 schrieb Jens Maus:
> >> Hi,
> >>
> >>> Am 20.01.2024 um 10:22 schrieb Stefan Wahren <wahrenst@gmx.net>:
> >>>
> >>> Am 19.01.24 um 22:26 schrieb Jens Maus:
> >>>> I actually do have some good and bad news:
> >>>>
> >>>> 1. Good news: I got u-boot finally showing up with my RaspberryPi5 8GB both on the HDMI and on the serial debug UART like you reported.
> >>>>
> >>>> 2. Bad news: I actually got it working by downgrading the rpi-eeprom to the same 2023/10/30 (VERSION:30de0ba5) version like you have.
> >>>>
> >
> > One idea would be to enable early debug in U-Boot (no idea how to
> > achieve this). I assume U-Boot crashes before it's able to print the
> > first line, but it's hard to believe it crashes at the very first
> > instruction of U-Boot. So with some luck we should be able to narrow
> > done the cause.
>
> I was able to enable early debug UART in U-Boot and I will try to
> find what is happening, once I get some free cycles.

Ok, this was relatively easy to find :-)

New versions of EEPROM firmware change “kernel”/U-Boot load address
from 0x80000 to 0x200000. And because on RPi’s CONFIG_TEXT_BASE is
hardcoded to 0x80000 code run through the fields.

Hopefully simple patch like bellow make it work fine in older and
newer EEPROM firmware versions.

Regards,
Ivan

diff --git a/configs/rpi_arm64_defconfig b/configs/rpi_arm64_defconfig
index 11ede9435d..ce64f9554f 100644
--- a/configs/rpi_arm64_defconfig
+++ b/configs/rpi_arm64_defconfig
@@ -1,6 +1,7 @@
CONFIG_ARM=y
CONFIG_ARCH_BCM283X=y
CONFIG_TEXT_BASE=0x00080000
+CONFIG_POSITION_INDEPENDENT=y