b0hemia
e0bc4785e9
Flashes the diskOS custom UI onto the FiiO Snowsky Disc over Ingenic mask-ROM USB, building the image from your own stock firmware. Runs from source via install.sh.
121 lines
5.4 KiB
Diff
121 lines
5.4 KiB
Diff
From 08f128d82f8e86dac5ca277d4fe4cc3fd7fef204 Mon Sep 17 00:00:00 2001
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From: b0hemia <50309975+b0hemia@users.noreply.github.com>
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Date: Mon, 24 Aug 2026 22:51:34 +1000
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Subject: [PATCH 1/8] baseline: burner_x2000 SPL that loads+executes on device
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(-fcommon + mask-ROM return shim)
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---
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arch/mips/cpu/xburst2/x2000/start.S | 23 +++++++++++++++++++++++
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config.mk | 2 +-
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tools/ingenic-tools/mmc_params | Bin 0 -> 14472 bytes
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3 files changed, 24 insertions(+), 1 deletion(-)
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create mode 100755 tools/ingenic-tools/mmc_params
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diff --git a/arch/mips/cpu/xburst2/x2000/start.S b/arch/mips/cpu/xburst2/x2000/start.S
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index caab455..2dcc1e2 100755
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--- a/arch/mips/cpu/xburst2/x2000/start.S
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+++ b/arch/mips/cpu/xburst2/x2000/start.S
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@@ -167,6 +167,29 @@ cache_alloc_a_line:
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li sp, 0x80001000
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#endif
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+#ifdef CONFIG_BURNER
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+ /*
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+ * DDR-only USB stage-1 (burner mode): board_init_f() brings up clocks and
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+ * SDRAM and then RETURNS (see arch/mips/cpu/xburst2/x2000/soc.c, the
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+ * CONFIG_BURNER branch). For usbboot to keep driving the USB session we
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+ * must hand control back to the mask ROM afterwards. Preserve the mask-ROM
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+ * return address (and sp) in a fixed TCSM scratch slot across the call --
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+ * board_init_f repoints/uses the stack internally, so a stack-relative save
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+ * is not reliable for the outer return. 0xb24017f0 lies in the param/pad
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+ * region below the code (offset 0x800) and is untouched by DDR init.
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+ */
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+ li t0, 0xb24017f0
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+ sw ra, 0(t0)
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+ sw sp, 4(t0)
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+ jal board_init_f
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+ nop
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+ li t0, 0xb24017f0
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+ lw ra, 0(t0)
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+ lw sp, 4(t0)
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+ jr ra
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+ nop
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+#else
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j board_init_f
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nop
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+#endif
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diff --git a/config.mk b/config.mk
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index f71e145..d78be30 100755
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--- a/config.mk
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+++ b/config.mk
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@@ -195,7 +195,7 @@ endif
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ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
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RELFLAGS= $(PLATFORM_RELFLAGS)
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DBGFLAGS= -g # -DDEBUG
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-OPTFLAGS= -Os #-fomit-frame-pointer
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+OPTFLAGS= -Os -fcommon #-fomit-frame-pointer (-fcommon: 2013 tree relies on tentative defs; GCC>=10 defaults -fno-common)
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OBJCFLAGS += --gap-fill=0xff
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diff --git a/tools/ingenic-tools/mmc_params b/tools/ingenic-tools/mmc_params
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new file mode 100755
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index 0000000000000000000000000000000000000000..78adebd875be1ac2ec4d41c346622d76fea5e1c4
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GIT binary patch
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literal 14472
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literal 0
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HcmV?d00001
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--
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2.43.0
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