[PATCH v3 0/6] board: samsung: e850-96: Support USB boot

[Minkyu Kang]

Hi,


2025년 11월 25일 (화) 05:47, Sam Protsenko <semen.protsenko at linaro.org>님이 작성:

> Hi Minkyu,
>
> If there are no objections, can you please apply this series to your tree?
>
> Thanks!
>
> On Tue, Nov 18, 2025 at 5:21 PM Sam Protsenko
> <semen.protsenko at linaro.org> wrote:
> >
> > When U-Boot is executed during USB boot [1,2] on E850-96 board, two
> > issues happen:
> >
> >   1. eMMC fails to initialize
> >   2. Attempt to use USB PHY driver leads to abort
> >
> > It was identified that issue #1 happens due to enalbed Flash Memory
> > Protector bits in MMC block registers during USB boot, and it's handled
> > in patch series [3].
> >
> > Issue #2 on the other hand happens because ROM code expects the
> > bootloader (U-Boot) to download remaining binaries (LDFW and TZSW) over
> > USB using SMC calls. Before that, the access to USB blocks (USB PHY and
> > DWC3) is disabled, probably because corresponding TrustZone domains are
> > configured for access from Secure World only.
> >
> > This patch series implements downloading LDFW and TZSW firmware over USB
> > during USB boot, which makes it possible to use U-Boot for flashing
> > images to eMMC using fastboot and DFU protocols. That in turn simplifies
> > the U-Boot development, as one can use `dltool' [1] to run U-Boot binary
> > during USB boot, and update U-Boot on eMMC this way (e.g. using DFU).
> > It's not possible when using LittleKernel bootloader, as it expects
> > non-standard Samsung GPT partition, but in case of U-Boot we use the
> > regular one.
> >
> > Once this patch series and patch series [3] are applied it'll be
> > possible to use U-Boot during USB boot. The two series are independent
> > of each other, and can be applied in any particular order.
> >
> > Changes in v3:
> >   - Added PATCH #6 (enter DFU automatically on USB boot)
> >   - Rebased on top of the most recent master
> >
> > Changes in v2:
> >   - PATCH #4: Return 0 on success in load_image_usb()
> >
> > [1] https://gitlab.com/LinaroLtd/e850-96/tools/dltool
> > [2] https://docs.u-boot.org/en/latest/board/samsung/e850-96.html
> > [3]
> https://lore.kernel.org/u-boot/20251026010658.19271-1-semen.protsenko@linaro.org/
> >
> > Sam Protsenko (6):
> >   board: samsung: e850-96: Keep public functions together
> >   board: samsung: e850-96: Add routines for checking boot dev
> >   board: samsung: e850-96: Split LDFW loading and init
> >   board: samsung: e850-96: Add routine for loading images over USB
> >   board: samsung: e850-96: Load firmwares over USB on USB boot
> >   board: samsung: e850-96: Enter DFU automatically on USB boot
> >
> >  board/samsung/e850-96/Makefile  |  2 +-
> >  board/samsung/e850-96/bootdev.c | 99 +++++++++++++++++++++++++++++++++
> >  board/samsung/e850-96/bootdev.h | 23 ++++++++
> >  board/samsung/e850-96/e850-96.c | 71 ++++++++++++++++++-----
> >  board/samsung/e850-96/fw.c      | 76 ++++++++++++++++++-------
> >  board/samsung/e850-96/fw.h      | 10 +++-
> >  6 files changed, 246 insertions(+), 35 deletions(-)
> >  create mode 100644 board/samsung/e850-96/bootdev.c
> >  create mode 100644 board/samsung/e850-96/bootdev.h
> >
> >
> > base-commit: 91861e5a30d217d8e70130c9124c1646f4afef29
> > --
> > 2.47.3
> >
>

applied to u-boot-samsung.

Thanks,
Minkyu Kang.

>