Mantra for Tirumala hill climbing:
Seven hills of Tirumala itself Sri Venkateswara Swaroopam. Seven peaks of Tirumala referred as Seshadhri, Neeladhri, Garudadhri, Anjanadhri, Vrushabhadhri, Narayanadhri and Venkatadhri.
Swarna (ah) chala! Mahapunya! Sarvade3va Nishevitha!
Brhamadha3yo (ah) pi yam de3vaaha sevanthaa sradh3dha4yaa saha
Tham Bha4vantham aham padh3bh4yaam aakrameyam nago3thama!
Kshamaswa thada3ga4m de3va dha3yayaa papachethasaaha
Thwan moordh3dh4ani krutha (ah) vaasham madha4vam darsayashva may
The Holy Golden Mountain which gives huge goodness, which is prayed by all Devas, which is served by Brahma and devas with great devotion. But I am climbing you with my foot, so kindly relieve me from this sin and give me the darshan of Madhava.
The mantra is in Skandha Puranam. We have to recite this, when we step on to the Golden Hill, requesting the mountain to pardon us for daring to keep our feet on this holy hill.