Re: 2026-04-29-netbsd-raspi-aarch64.img

[Jun Ebihara <jun%soum.co.jp@localhost>]

2026年4月29日(水) 22:01 Jun Ebihara <jun%soum.co.jp@localhost>:
> Topics:
> - Raspberry Pi 4 support on aarch64 FDT boot (without ACPI)
>  https://mail-index.netbsd.org/port-arm/2026/03/19/msg009556.html

https://github.com/tsutsui/netbsd-src/compare/trunk...rpi4-fdt-rev3

1. fdtbus: handle /chosen compatible "simple_bus" for Raspberry Pi 4
 https://github.com/tsutsui/netbsd-src/commit/d874cf1d6cc6842761dc01b364009300dc688e45

Description: This commit addresses an issue where the Raspberry Pi 4
firmware (start4.elf) dynamically populates the /chosen node with a
non-standard compatible string, "simple_bus".
Key Detail: It extends the existing special-case handling in
fdt_match() to recognize this string, preventing it from being treated
as a generic simplebus while allowing children like simple-framebuffer
to be properly enumerated.

2. aarch64/pmap: also prepare MD aarch64_mmap_flags() in PMAP_MI case
 https://github.com/tsutsui/netbsd-src/commit/89ba6090fe6d105494cc4d938ccb91da2b9785bf

Description: A fix to ensure the Machine Dependent (MD) function
aarch64_mmap_flags() is prepared even in PMAP_MI (Machine Independent
pmap) cases.
Key Detail: It defines memory attributes for the AArch64 architecture,
including WriteBack, WriteThru, NoCache, and Device modes, to
correctly handle pmap flags.

3. bcm283x: skip bcmgenfb specific initialization in !bcmgenfb case
 https://github.com/tsutsui/netbsd-src/commit/84266741175d3bacd55d286e3d14ef38c2a3e426

Description: This commit fixes an issue where incorrect BGR colors
appeared on the Raspberry Pi 4.
Key Detail: It introduces a check (rpi_genfb_is_bcmgenfb) to skip
bcmgenfb-specific initialization when the system is instead using
simplefb with FDT properties for its display setup.

4. evbarm/conf: add bcm2838pcie and bcm2838rng for Raspberry Pi 4B
 https://github.com/tsutsui/netbsd-src/commit/2fcf08d60fb497627644955862f09f1019293b30

Description: The addition of support for specific hardware components
on the Raspberry Pi 4B within the `GENERIC64` configuration.
Key Detail: It enables the bcm2838pcie (STB PCIe host controller) and
bcm2838rng (Broadcom BCM2838 Random Number Generator) drivers.

5. aarch64: fix /dev/mem mmap cookie handling for MMIO devices
 https://github.com/tsutsui/netbsd-src/commit/628b13a357c0da159ba1577c9347020a05d522ee

Description: This fix addresses a bug where /dev/mem mmap(2) calls on
AArch64 could incorrectly map MMIO registers as normal cacheable
memory.
Key Detail: The code was adjusted to return PMAP_DEV_NP only when
AArch64_MMAP bits are zero, the physical address is unmanaged, and the
address resides within a devmap region.

-- 
Jun Ebihara