From fb55ef5d3c6bdef65106d27ad750ed8a52238f78 Mon Sep 17 00:00:00 2001
From: Sven Schwermer <sven@svenschwermer.de>
Date: Fri, 10 Oct 2025 23:28:30 +0200
Subject: [PATCH] fix: Correctly detect Adesto flash size

Adesto/Atmel flash chips report their size differently than most. This
patch is equivalent to what has previously been applied to esptool with
0b56f85.
---
 cores/esp8266/Esp.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/cores/esp8266/Esp.cpp b/cores/esp8266/Esp.cpp
index 8a3ea32515..cb5d3e075b 100644
--- a/cores/esp8266/Esp.cpp
+++ b/cores/esp8266/Esp.cpp
@@ -289,7 +289,12 @@ uint8_t EspClass::getFlashChipVendorId(void)
 
 uint32_t EspClass::getFlashChipRealSize(void)
 {
-    return (1 << ((spi_flash_get_id() >> 16) & 0xFF));
+    uint32_t id = spi_flash_get_id();
+    if ((id & 0xFF) == SPI_FLASH_VENDOR_ATMEL) {
+        return (0x8000 << ((id >> 8) & 0x1F));
+    } else {
+        return (1 << ((id >> 16) & 0xFF));
+    }
 }
 
 uint32_t EspClass::getFlashChipSize(void)