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doc: samsung: Fix PXE doc for E850-96 board

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As stated in PXELINUX doc [1], the PXE configuration file has to be in
the format of "01-MAC-address" for Ethernet connections:

    The hardware type (using its ARP "htype" code) and address, all in
    lowercase hexadecimal with dash separators. For example, for an
    Ethernet (i.e. ARP hardware type "1") with address
    "88:99:AA:BB:CC:DD", it would search for the filename
    "01-88-99-aa-bb-cc-dd".

Indeed, PXE implementation in U-Boot looks for files like that, as can
be seen from this call chain:

    format_mac_pxe()
    pxe_mac_path()
    pxe_get()
    extlinux_pxe_read_bootflow()

Mention the fact that PXE expects the configuration file to be prepended
with "01" in the PXE section of E850-96 documentation. While at it, fix
some other minor issues in PXE section.

[1] https://wiki.syslinux.org/wiki/index.php?title=PXELINUX

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
This commit is contained in:
Sam Protsenko
2025-11-21 19:26:52 +01:00
committed by Heinrich Schuchardt
parent b0be86bbf8
commit a5dc935df7
1 changed files with 10 additions and 5 deletions
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doc/board/samsung/e850-96.rst
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@@ -637,9 +637,14 @@ machine:
`-- pxelinux.cfg
`-- 01-02-36-f5-1c-81-13
where ``'01-02-36-f5-1c-81-13'`` file contains extlinux configuration for
TFTP to load and boot. The name of this file is the Ethernet MAC address,
which can be looked up in the ``$ethaddr`` environment variable in U-Boot.
where ``'01-02-36-f5-1c-81-13'`` file contains extlinux configuration for TFTP
to load and boot. The name of this file has to be in the format of
``'01-MAC-address'``. The Ethernet MAC address in this case is
``02-36-f5-1c-81-13``, and it can be looked up in the ``$ethaddr`` environment
variable in U-Boot::
=> env print ethaddr
ethaddr=02:36:f5:1c:81:13
An example of such configuration file is::
@@ -667,11 +672,11 @@ machine:
arch/arm64/configs/defconfig
----------------------------
# Needed for boot from USB storage (mounting rootfs from USB drive)
# Keep USB PHY driver built-in, as the Ethernet controller sits on USB bus
CONFIG_PHY_EXYNOS5_USBDRD=y
CONFIG_TYPEC=y
# Needed for NFS boot
# Keep Ethernet driver built-in
CONFIG_USB_NET_SMSC95XX=y
CONFIG_USB_USBNET=y