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startup: clear MAP_FLASH_PAGE_TO_XDATA before the C runtime initialises xdata

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Hardware reset starts the firmware with SFR 0x97 = 1, which maps xdata
0x4000-0xbfff to the flash image: reads return flash bytes, writes are
lost. main() cleared it only after __mcs51_genXINIT and the XSEG clear
had run, so XISEG (initialised globals) and the part of XSEG above
0x4000 kept stale RAM contents, e.g. session_timeout = 4484 and LLDP
blocked on logical ports 0, 3 and 5. Clear it in
__sdcc_external_startup(), which SDCC calls before both.

Rename SFR_97 to MAP_FLASH_PAGE_TO_XDATA.
This commit is contained in:
Andre Brait committed 2026-10-26 17:08:27 +01:00
1 parent 80a30b705e
commit 98763e3bff
4 files changed
+17 -3
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rtl837x_sfr.h
+1 -1
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@@ -55,7 +55,7 @@ __sfr __at(0xbb) SFR_BANK_RET;
__sfr __at(0x8e) CKCON;
__sfr __at(0x97) SFR_97; // HADDR?
__sfr __at(0x97) MAP_FLASH_PAGE_TO_XDATA; // 1 (hardware reset default): xdata 0x4000-0xbfff reads the flash image; 0: RAM
__sfr __at(0xb9) SFR_b9;
__sfr __at(0xba) SFR_ba;