From a3a86bdf195ed9eb6ebe59a78189a61fd2d743f0 Mon Sep 17 00:00:00 2001
From: alan <652732310@qq.com>
Date: Tue, 17 Jun 2025 16:14:16 +0800
Subject: [PATCH] make basefee 0 always reachable

---
 consensus/misc/eip1559/eip1559.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/consensus/misc/eip1559/eip1559.go b/consensus/misc/eip1559/eip1559.go
index a90bd744b2..e7335a5ebd 100644
--- a/consensus/misc/eip1559/eip1559.go
+++ b/consensus/misc/eip1559/eip1559.go
@@ -89,7 +89,13 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
 		num.Div(num, denom.SetUint64(parentGasTarget))
 		num.Div(num, denom.SetUint64(config.BaseFeeChangeDenominator()))
 
-		baseFee := num.Sub(parent.BaseFee, num)
+		var baseFee *big.Int
+		if num.Cmp(common.Big1) < 0 {
+			baseFee = num.Sub(parent.BaseFee, common.Big1)
+		} else {
+			baseFee = num.Sub(parent.BaseFee, num)
+		}
+		
 		if baseFee.Cmp(common.Big0) < 0 {
 			baseFee = common.Big0
 		}